US1152010A - Speedometer. - Google Patents

Description

w. N. DENN'ISON.

SP EEDOMETER.

APPLICATION FILED APR- 3..l912.

Patented Aug. 31, 1915.

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WITNESSES ATTORNEY cow/mam PLANOGRAPH conwnsnmc'rou, D. c,

ill TAT WILBURN N. DENNISON, OF MERCHANTVILLE, NEW JERSEY, ASSIGNOR TO VICTOR TALKING MACHINE COMPANY, A CORPORATION OF NEW JERSEY.

SPEEDOMETER.

Specification of Letters Patent.

Patented Aug. 31, 1915.

Application filed April 3, 1912. Serial No. 688,280.

To all whom it 1. my concern Be it known that I, VVILBURN N. DENNI- soN, a citizen of the United States, and a resident of liferchantville, New Jersey, have invented certain new and useful Improvements in Speedometers, whereof the following is a specification, reference being had to the accompanying drawings.

This invention particularly relates to that class of speedometers wherein relatively rotatable driving and driven fans, respectively having blades or vanes, are disposed in such opposed relation that the positive rotation of one of said fans tends to effect the rotation of the other, to actuate means indicating the speed of the mechanism to which the driven fan may be connected. Such speedometers, however, have been found to be inaccurate and otherwise unsatisfactory, which is believed to be due, among other causes, to the fact that the air current created by the driving fan are permitted to diffuse, and, therefore, such air currents cannot exert their full force against the blades of the driven fan to deflect the latter in precise ratio to the speed of rotation of the driving fan.

The principal objects of this invention are, to obviate the difficulties noted, and to substantially eliminate the inaccuracies incident thereto, by providing efiicient means arranged to confine the air to the zone of activity of the blades between the co-acting fan members.

Another object of this invention is, to provide 'fan members forming a closure having cylindrical walls or flanges, disposed respectively within and without the annular path of the fan blades, and to telescopically arrange said walls or flanges so as to form substantially air-tight seals for confining the air within the closure formed by the fan members, and yet permitting the free relative rotation, and the axial' adjustment of said fan members, without breaking the seals.

Other objects of this'invention are, to provide mountings for the fan members which permit their relative axial adjustment; to provide means to effect the relatively axial adjustment of said fan members, to vary the distance between the blades and to provide means for adjusting said tension means to regulate the Zero position of said driven fan. j

Another object of this invention is, to provide an air-tight casing inclosing said fan members, in order to prevent communicati on between the air chamber formed thereby and the atmosphere, to insure against the possibility of the instrument being afi'ected by change of altitude and other barometic or atmospheric changes.

Further objects of this invention are, to provide a simple, efficient and accurate speedometer which may be readily mounted on, or directly connected with, the governor shaft or other positively driven motor member of a talking machine, and be rotated therewith to indicate the speed of rotation of the turn-table, whereby'absolute" accuracy is attained, since lost motion between the governor and regulator may be effectively obviated.

This invention further includes all of the various novel features of construction and arrangement hereinafter more definitely specified.

In the accompanying drawings, Figure 1 is an inverted plan view of a talking'machine conveniently vembodying a speedometer constructed in accordance with. this invention, the cabinet being shown in section for convenience of illustration; Fig. 2"is acentral longitudinal sectional view of the speedometer, per 86, Fig. 3 is a transverse vertical sectional view of the speedometer shown in Fig. 2, taken on the line 33 in said figure; Fig. 4 is a transverse vertical sectional view taken on the line 4i4 in Fig.

2; Fig. 5 is a fragmentary vertical sectional view taken on the line 55 in Fig. 1; Fig. 6 is a fragmentary perspective view of the fan members; and Fig. 7 is a fragmentary perspective view of the fan members embody-- ing a modification of the blades.

In said figures,the cabinet comprises the walls 8 and the lid or cover 9, to which the frame 10 of the motor mechanism is secured. Said motor mechanism comprises the spring barrels 11 having the winding stem 12, and is connected through suitable gearing with the governor 14, which comprises the rotatable shaft or spindle 15, and the disk 16 axially movable on said spindle 15 by the centrifugal movement'of the governor balls 17.- The axial movement of said disk 16 in the direction of the arrow indicated thereon, and, consequently,the speed of rotation of the governor, are limited by the adjustable friction pad 18, carried on the arm 19 secured to the rockshaft 20, which is journaled in suitable bearings 21 and 22 in the frame 10, and which has its free end bent laterally to form a lever 23. Said lever 23 may be adjusted vertically to shift the pad 18 into different positions to vary termined speed of rotation of said governor, by the set screw 25 extending through the lid or cover 9 and having its head 26 projecting exterior thereto for convenient actuation by the operator.

The spindle 15 has an extension 27 rotatable therewith, and having a coupling-head 28 provided with pins 29 conveniently engaged in suitable apertures or recesses 30 in the opposed coupling-head 31, which is secured to the shaft 32 of the speedometer. The talking machine mechanism herein shown and described is typical, it being understood that the speedometer may be otherwise connected to said mechanism, or may be connected with mechanism otherwise constructed.

The speedometer is provided with a casing 33 having a front cover 34 and a protecting cap 35, the casing 33 having its outer periphery recessed, and the cover 3 1 having a flange 36 fitted to said recess and secured thereto by screws 37, with its outer cylindrical face flush with the outer cylindrical face of the casing 33, and the protecting cap being secured to the front face of said cover 34 by screws 39, and inclosing adjustable mechanism, hereinafter described, in a substantially air-tight chamber.

The shaft 32 is mounted for rotation in the adjustablebearing block 40, which is in threaded engagement with a reduced cylindrical extension 41 of the casing 33, and is provided with suitable apertures 42 for the convenient engagement of a spanner-wrench, whereby said bearing block may be adjusted axially with respect to the casing 33.

The shaft 32 has a reduced end trunnion the prede- I fan blades or vanes 63 preferably H, which is conveniently journaled within the casing 33 in a bearing ewel 15, having a suitable mounting 16 which is conveniently retained in the bearing support a7 by the an nular nut 48, which is in threaded engagement with said bearing support 17. The bearing support 47 carries a sealing member 19, preferably having the substantially cylindrical extension embracing the jewel bearing members, and is itself carried by the spider frame 50, having a cylindrical wall 51 which extends away from said sealing member -19. Said spider frame 50 is also provided with a peripheral cylindrical wall or rim having a radially extending peripheral flange secured to the inner wall of the casing 33 by the screws 5 1; the cylindrical wall 51 and the peripheral cylindrical rim 52 of said spider frame being preferably joined by the arms 56, as may be best seen in Fig. 4: of the drawings.

The shaft 32 carries the driving fan, comprising the hub 58 of the rotatable fan disk or wall 59, which is provided with the cylin drical recess the cylindrical wall 60 of which embraces the cylindrical sealing member 19 and coiiperates therewith to form a substantially air-tight joint, and said fan disk 59 is also provided with the peripheral cylindrical wall, rim or flange 61 comprising a sealing member, extending in close concentric relation with the peripheral cylindrical rim of the stationary spider frame 50, and forming therewith a substantiallv air-tight joint. Said fan disk 59 carries an annular series of disposed radially in equally spaced relation within the cylindrical wall 61 of the disk 59.

As best shown in Fig. 2 of the drawings, the vanes 63 are provided with lugs 6-1 and 65, respectively extended through suitable apertures 66 in the fan disk 59 and riveted over, preferably by respectively bending said lugs 64 and 65 in opposite directions, whereby said vanes are maintained in co-axial. radial. planes, with their outer edges in abutted relation with the peripheral rim 61, and their inner edges extending into close proximity to the cylindrical wall 51,

A ball thrust bearing is preferably provided between the hub 58 of the driving fan and the bearing block -10, and comprises the spacing ring Gl'for the balls 68. The shaft 32'is provided exterior to the casing 33 with a collar 69 suitably engagedwith said shaft by the set screw 70, and having a bearing rim 71 engaging the outer face of said block 40 to maintain said thrust, bearing in its operative position.

The driven fan comprises the rotatable fan disk 72, carrying the fan blades or vanes 73 and having a flanged cylindrical outer wall or rim T l forming a sealing member, telescopically embracing the cylindrical wall of the spider frame 50 and the cylindrical rim 61 of the driving fan, to form a substantially air-tight joint, and having the central recess the cylindrical walls 75 of which inclose the hub 76 and are conveniently secured thereto. Said hub 76 also carries the cylindrical sealing member 78, having its free cvlindrical Wall telescoped with the cylin'drical wall 51 of the spider frame 50, thereby coiiperating with the said cylindrical wall 51to form a substantially air-tight joint, and embracing the adjacent end of the bearing support 47.

The hub 76 is carried by the spindle 79, which is provided with reduced opposite end trunnions 80 and 81, the trunnion 80 being supported in the jewel bearing 82 having the mounting 83, with its end disposed against the thrust jewel bearing 84 having the mounting 85 and the trunnion 81 being supported in the jewel bearing 90 having the mounting 91, with its end disposed against the thrust jewel bearing 92 having the mounting 93.

The bearing mountings 83 and 85 are secured in the bearing support 47 by the annular nut 87, and the bearing mountings 91 and 93 are secured by the annular nut 94 in the adjustable bearing stud 95, which is in threaded engagement with the wall of the cover 34, and which is prevented from accidental displacement by the jam-nut 97.

The fan disk 72 carries the annular series of blades or vanes 73 in opposed relation to the blades or vanes 63, and said blades or vanes 73 are secured to said fan disk 72 by lugs 101 and 102 respectively extending through suitable apertures in said fan disk 72 and riveted over, preferably by bending said respective lugs in opposite directions, as shown in Fig. 4, and said blades or vanes have their outer ends abutted against the flanged rim 74, and their inner ends terminating short of the cylindrical wall of the recess 75.

In the preferred form of this invention, the blades 73 extend outwardly from the plane wall of thefan disk 72 for a short distance, normal thereto, and have a portion 77 turned obliquely and extended rear- \vardly with respect to the direction of rotation of the fan when actuated by the driving fan, as best shown in Figs. 2, 4 and 6.

In the modification shown in Fig. 7, however, the blades 103 of the driven fan are flat, like the blades 63 of the driving fan, and although the blades have been shown and described as being in co-axial radial planes, it is to be understoodthat they may be otherwise disposed, as, for instance, in planes tangent to a common circle.

The spindle 79 carries the collar 105, which is secured to the inner end of the helical hairspring 106, the outer end of which is secured to the post 107, which may be adjusted circularly around the axis of said spindle 79, in the opening 108 in the wall of the cover 34, and which is carried by the plate 109 embracing the bearing stud 95 and having circularly disposed slots 110, through which the set screws 111 extend in threaded engagement with the cover 34.

It will be observed that the tension of the hairspring 106 may be varied by rotatively adjusting the plate 109 so as to regulate the zero position of the driven fan comprising the fan disk 72 and the blades or vanes 73. The rotative movement of said driven fan may be limited by the engagement of the projecting post 112, which is carried thereby, with the stopping bar 113, which extends, at its lower portion, along the inner face of the cover 34 and is secured thereto by the screw 114, and which has the offset upper portion extending through the aperture 115 in the post 116 projecting from'the cover 34 and arranged to maintain the free offset end of said stopping bar 113 in the path of said post 112.

The rim 74 of the fan disk 72 conveniently provides means for carrying'suitable graduations, or other characters, indicating the speed of rotation of the shaft 32, and may preferably carry a strip 118 of paper, metal, celluloid, or other suitable material, having such graduations or characters indicated thereon and arranged to be presented into registry with the sight aperture 119 in the cylindrical wall 120 of the casing 33, said sight aperture 119 being preferably covered by'the glass or other transparent plate 121 secured thereto by the flanged frame or rim 122.

As best shown in Fig. 5, the lid 9 of the cabinet is provided with an aperture 125 suitably disposed in registry with the sight aperture 119, and said aperture 125 may be preferably provided with the escutcheon plate 126 having its central portion 127 depressed toward said sight aperture 119, and provided with a suitable aperture 128, through which the speed indications onthe strip 118 carried by the rim 74 of the fan member 72 may be read.

To insure a substantially air-tight closure formed by the casing 33, cover 34 and cap 35, the bearing block 40 may be provided with a pocket 130, having extensions 131 and 132 embracing the shaft 32, and substantially forming a stufling-box which may be packed with grease 135.

From the foregoing description, it will be readily observed that the telescopically disposed walls 61 and 74 at the periphery of the fan disks, and the cylindrical walls of the sealing members 49 and 78, and the cylindrical walls 60 and 51 respectively, at the center of the disk59 and spider 50, coiiperate to form substantially air-tight seals between the fan members, and provide anannular substantially air-tight chamber, within which the air is confined in the zone of activity of the blades, whereby a greater accuracy is attained in the actuation of the driven fan by the driving fan, than is attained by speed indicators wherein the air is unconfined, and is free to diffuse. Furthermore, it will be noted that as the fans are adjusted toward each other to increase the pressure of the air created by the driving fan and directed upon the driven fan, the overlap of the members forming the airseals will be similarly increased.

As has been heretofore described and fully set forth, a substantially airtight seal is provided between the sealing member 49 and the cylindrical wall of the recess 16; between the sealing member 78 and the cylindrical wall of the recess 50; between the flanged rim 7a and the outer cylindrical wall 52 of the spider frame 50; and between the cylindrical rim 61 and the inner cylindrical surface of the wall or rim 52. In the drawings the space between these various telescoping flanges is shown on an exaggerated scale for the sake of clearness' in illustration.

Although the fans are shown as having members disposed in telescopic relation to form seals which do not interfere with the free relative rotation of said fans, it is to be understood that air-seals may be formed between said fans by having members in abutted relation, or other structures may be employed to confine the air in the zone of ac tivity of the blades, and, therefore, it is not desired to limit this invention to the precise details of construction and arrangement herein set forth, as various modifications may be made therein without departing from the essential features of the invention as defined in the appended claims.

Having thus described my invention, I claim:

1. A speedometer comprising opposed relatively rotatable coaxial air compressing members, and means extended therebetween for confining the air substantially within the zone of activity of said members.

2. A speedometer comprising coaXially mounted driving and driven fans, and coacting sealing members carried by and extending between the fans to confine the air.

8. A speedometer comprising co-acting relatively rotatable fan disks, and blades on adjacent faces of the disks, and means disposed peripherally on one of the disks and extending toward the other disk, for confining the air.

A. Relatively rotative members forming a substantially air-tight chamber and respectively having means in said chamber, cooperative when one of said members is positively actuated, to shift the other member into position to indicate the speedof rotation of said'actuated member.

5. A speedometer comprising relatively rotatable members, cooperative to form an inclosed substantially air-tight chamber, and respectively having members within said chamber, cooperative when one of said members is positively rotated to affect the actuation of the other member into position to indicate the speed of rotation of said positively rotated member.

G. A speedometer comprising relatively rotatable members disposed in telescoped relation, and forming a substantially air-tight chamber, and respectively carrying opposed vanes disposed in such relation that when one of said members is rotated, the other member is actuated by the air currents generated by said rotated member to indicate the speed of rotation of the rotating member.

7. A speedometer comprising opposed fan members having peripheral flanges in telescopic relation, and forming an inclosed substantially air-tight chamber, vanes carried by the respective fan members and disposed in opposed relation, one of said members being turned by the air currents generated by the rotation of the other member, and indicating its speed of rotation.

S. A speedometer comprising relatively rotatable members having sealing means disposed in telescopic relation, and forming an inclosed substantially air tight chamber, blades or vanes carried by the respective members within said chamber, one of said members being provided with speed indicating characters, turned by the motion of the air confinedin said chamber, effected by the rotation of the other member.

9. A speedometer comprising opposed relatively rotatable fan members having telescopically disposed peripheral sealing members forming a substantially air-tight chamber, and respectively carrying opposed blades or vanes cooperative when one of said members is rotated to effect a motion of the air confined therein, to actuate the other member, means tending to retard the movement of said actuated member, and means carried by said actuated member to indicate the speed of the rotating member.

10. A speedometer comprising relatively rotatable fan members having sealing members telescopically disposed, and forming a substantially air-tight chamber, and blades or "anes carried by the respective fan mem bers in opposed relation, within said chamber.

11. A speedometer comprising relatively rotatable fan disks having peripheral sealing members disposed in telescopic relation, and forming a substantially air-tight chamber, means connected to positively rotate one of said disks, resilient means operative to retard the rotation of the other disk, means carried by said respective disks within said substantially air-tight chamber, and operative when the positively rotated disk is actuated to produce air currents operative to turn the other disk in opposition to said retarding means.

12. In a speedometer, the combination with a casing, of relatively movable fan members disposed within said casing, and having peripheral walls in telescopic rela tion, arranged to form a substantially airtight chamber, blades or vanes carried by the respective fan members in opposed relation within said chamber, means journaled in said casing, and connected to rotate one of said fan members, to produce a turning moment for actuating the'other fan member, and means operative to retard the movement of said actuated fan member.

13. A speedometer comprising relatively rotatable opposed fan members forming a substantially air-tight chamber and having blades, some of which are bent obliquely with respect to the side walls of said fan members.

14. A speedometer comprising relatively rotatable fan members respectively having blades disposed in coacting relation, and having sealing members arranged to form an annular substantially air-tight chamber, for confining air in the zone of activity of said blades.

15. A speedometer comprising relatively rotatable opposed members telescopically arranged, and forming anair seal, blades carried by said members and disposedin coacting annular series within said air seal, and sealing means disposed within said annular series of blades and forming air seals with said members, for confining the air in the annular zone of activity of the blades.

16. A speedometer comprising opposed fan members forming an inclosed chamber, one being positively connected with the governor shaft of talking machine motor mecha nism, and the other being rotated by the rotation of the first mentioned fan member.

17 In a speedometer, the combination with a casing, of adjustable bearings in said casing, relatively rotatable fans having blades or vanes in opposed relation supported in said bearings, means to positively rotate one of said fans to drag the other fan around therewith by air currents thus pro duced, and means to adjust said bearings to vary the drag effected by one fan upon the other fan.

18. In a speedometer, the combination with a support, of adjustable bearings carried thereby, an intermediate bearing disposed between said adjustable bearings, a spider frame secured to said support and carrying said intermediate bearing, relatively rotative fans, a shaft for one of said fans, movable axially with its adjustable bearing, and a spindle for the :other fan,

position by and forming air seals with said fan memhers, the inner and outer air seals being operative to confine air within said fan members in the annular zone of activity of the blades.

20. In a speedometer, the combination with a casing, of relatively rotative fan members having peripheral flanges in telescopic relation, operative to form a substantially air-tight chamber, blades or vanes respectively carried by the fan members in opposed relation, a spider frame secured to said casing, and extending into said chamber between said blades or vanes, and having a bearing supporting said fan members, within said chamber.

21. In a speedometer, the combination with a casing having bearings, of relatively rotatable fan members having telescoped peripheral walls forming a substantially air-tight chamber, blades or vanes respectively carried within said fan members, in opposed relation, a spider frame carried by said casing, and having a cylindrical rim disposed between said telescoped walls, and having connecting arms disposed between said blades or vanes and supporting bearings within said chamber, and shafts or spindles respectively journaled in said bearings to support said fan members.

22. In a speedometer, the combination with a casing having bearings, of relatively rotative fan members having peripheral walls-in telescopic relation, forming a substantially air-tight-chamber between said fan members, a spider frame secured to said casing, and having a cylindrical rim extending between said telescoped walls, and arms extending between said fan members, a bearing supported within said chamber by said spider frame, shafts or spindles journaled in said bearing and respectively supporting said fan members, means carried by the respective fan members within said chamber, and cooperative when one of said fan members is rotated to effect the turning of the other fan member, means tending to retard the movement of the last mentioned fan member, and means operative to limit its movement.

23.In a speedometer, the combination with a support, of relatively rotative fan members, having peripheral flanges dis- .bers, means connected to positively rotate one of said members, and means tending 1, to retard the rotation of the other member,

the flange of the retarded member being provided with speed indications to designate the speed of rotation of said positively rotated member.

24. In a speedometer, the combination with a support having bearings, of relatively rotative members having telescopically disposed rims forming a substantially air-tight chamber between said members,

blades or vanes respectively carried by said members in opposed relation and cooperative when one member is rotated to tend to drag the other member in the same direc tion, a spider frame carried by said support and extending between said fan members, a bearing carried by said spider frame and disposed within said chamber, means journaled in said bearing, rotatably supporting said fan members, and means arranged to axially adjust said fan members to vary the effective drag between the vanes of said fan members.

25. In a speedometer, the combination with a casing, of relatively rotatable fan members having sealing means forming a substantially air-tight chamber between said fan members, adjustable bearings carried by said casing, blades or vanes respectively carried by said fan members within said casing in opposed relation, a spider frame carried by said casing and extending between said members, and having arms extending between said vanes, a bearing member carried by said spider frame within said chamber, and provided with separate bearings,,means operative to positively rotate one of said members to affect the actuation of the other member, and means arranged to axially adjust said members to vary the effect of one member upon the other member.

26. In a speedometer, the combination with a casing having a sight aperture, of relatively rotatable fans disposed within said casing, and having peripheral flanges forming a substantially air-tight chamber between said fans, means connected to positively rotate one of said fans to actuate the other fan by currents of confined air, means tending to retard the movement of the actuated fan, and means carried by the flange 1 of said actuated fan and having indications arranged to register with said sight opening in accordance with the speed of rotation of said positively rotated fan.

27. In a speedometer, the combination with a casing having a sight aperture, of relatively rotative hollow fan members having peripheral flanges in telescopic relation, forming a substantially air-tight chamber, blades or vanes respectively carried by said fan members within said chamber in opposed relation, means separately supporting said fan members, means connected to positively rotate one of said fan members to effect the actuation of the other fan member by confined air currents, resilient means tending to retard said actuated fan member, and means carried by the flange of said actuated fan member, and having speed indications registerable with said sight opening to indicate the speed of rotation of the positively driven fan member.

28. In a speedometer, the combination with a support having bearings, of a fan member having a central outward recess forming a cylindrical wall, and a peripheral cylindrical flange, a spider frame carried by said support and having a cylindrical rim surrounding said flange in telescoped relation, and having a central recess forming a cylindrical wall, a bearing member supported in the recess of said spider frame, and carrying separate bearings, a cup carried by said spider frame, having a cylindrical flange in telescopic relation with the cylindrical wall of the central recess of said fan member, a second fan member having a peripheral flange in telescopic relation with said spider frame and flange of said first mentioned fan member, and having an inwardly disposed central recess, providing a cylindrical wall, and a cup carried by said second mentioned fan member and providing a peripheral cylindrical flange in tel scopic relation with the cylindrical wall of the central recess of said spider frame, blades respectively carried by said fan members within the annular substantially air-tight chamber formed by said fan members and spider frame, and means arranged to axially adjust said fan members to vary the effect of the vanes of one fan upon the vanes of the other, said adjustment being made without affecting the air-tight joint between said fan members.

29. In a speedometer, the combination with a casing forming a substantially airtight chamber, of relatively rotatable fan members forming a closed chamber mounted in said casing, a shaft for one of said members extending through said casing, and a bearing for said shaft having a pocket embracing said shaft for containing grease.

30. In a speedometer, the combination with a substantially air-tight casing, of rotively rotatable fans forming an inner closed chamber and having blades or vanes in opposed relation in said chamber, a shaft for one of said fans extending through said casing, and a bearing having a pocket forming a stufiing-box embracing said shaft, for containing grease or a suitable packing matei ial.

32. A speedometer comprising opposed relatively rotatable air-compressing members, means extending therebetween for confining the air substantially within the zone of activity of said members, bearings rotatably supporting said air-compressing members, and means to adjust said bearings to vary the drag elfected by one fan upon the other fan.

83. A speedometer comprising driving and driven fans, coacting sealing members carried by and extending between the fans to confine the air, bearings rotatably supporting said fans, and means to adjust said bearings to vary the volume of air thus confined.

34. A speedometer including relatively rotatable members, coacting blades carried by said members respectively, a casing inclosing said members and blades, and means independent of said casing for confining air between said members.

85. A speedometer comprising relatively rotatable fan walls, blades on the adjacent faces of said walls, a casing for inclosing said walls and blades and means independent of said casing and co-acting with said walls for confining air in the zone of activity of the blades.

86. A speedometer comprising relatively rotatable fan walls forming a substantially airtight chamber, and respectively having air-resisting means within said chamber movable with said walls.

37. A speedometer comprising relatively rotatable fan walls, forming a substantially air-tight chamber, and having opposed blades projecting from said walls within said chamber.

38. In a speedometer the combination of two axially alined rotatable members, coacting blades or vanes carried by each of said members, means for adjusting one of said members axially with respect to the othenof said members to vary the drag eflected by one member upon the other, and sealing means movable with said members and operable in different axially adjust-ed positions to confine the air between said members.

39. In a speedometer the combination of two axially alined rotatable members, coacting blades or vanes carried by each of said members, means for adjusting one of said members axially with respect to the other of said members to vary the drag effected by one member upon the other, and sealing means movable with said adjustable member toward and away from the other of said members and operable in its different adjusted positions to confine the air between said members to the Zone of activity of said blades or vanes.

40. A speedometer including telescoped members separately rotatable about a common axis, blades carried by the respective members and interposed therebetween, and means for adjusting one of said members in the direction of said axis.

In witness whereof, I have hereunto set my hand this 2nd day of April, A. D., 1912.

IVILBURN N. DENNISON.

Witnesses:

FRANK B. MIDDLETON, J r., JOHN D. Mynns.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). G.

It is hereby certified that in Letters Patent No. 1,152,010, granted August 31, 1915, upon the application of Wilburn N. Dennison, of Merchztntville, New Jersey, for an improvement in Speodometers, an error appears in the printed specification requiring correction as follows: Page 1, line 21, for the word current reed currents; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 28th day of September, A. D., 1915.

J. T. NEWTON,

Acting Commissioner of Patents.

[SEAL]

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