US893277A - Telegraphone. - Google Patents

Telegraphone. Download PDF

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US893277A
US893277A US38210107A US1907382101A US893277A US 893277 A US893277 A US 893277A US 38210107 A US38210107 A US 38210107A US 1907382101 A US1907382101 A US 1907382101A US 893277 A US893277 A US 893277A
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Prior art keywords
magnets
carriage
record
base
disk
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US38210107A
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Harve Reed Stuart
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Harve Reed Stuart
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    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G11B25/043Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card using rotating discs

Description

N. 893,277. PATENTED JULY 14, 1908.
' H. R. STUART.
TELEGRAPHONE. APPLICATION FILED JULY 3. 1907.
4 SHEETS-SHEET 1.
mm ...MINI
Q' )Umcooco PATBNTED JULY 14, 1908.
EL R. STUART.
TELEGRAPHONE.
APPLIGATION FILED JULY a. 1907.
iilllllllllllllllllllll1* 9o @dimmi um* W .minimum PATLNTBD JULY 14, "1908.
4 SHEETS-SHEET 3.
No. 893,277. Y PATENTED JI'ILY 14. 1908.
H. B.. STUART.
TBLEGRAPHONE.
APPLIOATIoN HLBD JULY s. 1907.
4 SHEETS-SHEET 4.
lill
33%@ attozwzgs HARVE REED STUART, OF `WHELING, WEST VIRGINIA.
TELEGBAPHONE.
Specification of Letters Patent.
Patented July 1.4, 190s.
Application led July 8, 1907. Serial No. 382,101.
. To all whom it may concern:
and .useful Im act' description.
' the disk, because,
Be it known that I, HARVE REED STUART,
a citizen of the United States, residing at.
Wheeling, in the county of Ohio and State of West Virvinia, have invented certain new of which the fo owing is a full, clear, and ex- My invention relates to telegraphones, and has for its object the rovision of means for increasing the strengt of the magnetic imressions' which are to be produced upon or 1n a record medium and re roduced therefrom at will, and the app ication of said means to record surfaces which move at different speeds, (as for. instance various points upon a rotatin disk), in Asuch a Way as to produce a soun record in which the amplitude or strength .is uniform throughout, i. e. which will produce sounds of uniform lstrength'when reproduced. To this end, I contemplate the use of two or more magnets and which are preferably electrically connected in the same circuit, either in series or in parallel with each other, so that the cumulative or joint effectI of the two magnets will be obtained upon the receiver and cause its diaphragm to vibrate with greater amplitude than would either magnet alone, an l' apply the said magnets to the surface of a moving record medium or the surfaces of two separate moving mediums at points which are moving at different rates of speed in such alway as to produce a strong and uniform record or reproduction from suc record.- For example, when my invention is embodied in a mechanlsm in which the record medium is a revolving steel dlsk, the two magnets.
will be preferably arranged upon opposite faces of the said disk,` and a progressive movement will be given to each of the magnetsso as to cause the same to traverse the surface of the disk from a point near its EperipheryA to a point near its center, andthe 45 two 'ma ets will be caused to move simultaneous y 1n o poslte directlons, one starting from near t e center of the disk and the ot v er from near the periphgr, whereby an absolutely uniform effect be obtained irrespective of the relative positions of the two magnets with res ect to the center of a though the surface points of the disk vary other, the'sum of the speeds of the varlous with` respect to each rovements in Telegraphones,
4electrical connections will panying drawing,
velocities of the two points of the disk which are being acted upon b the two magnets, at any 'v en moment wil be always the same, the dis of course, being rotated at a uniform rate of speed.
The gist of my invention is the mounting of a a1r of magnets in such a way that during t e o eration of the instrument the magnets willp always be at different distances from the center of the record disk. The referably be made in the manner describe but it 1s obvious that said connectionsl may assume various forms, or any form by which the magnets when arranged as above stated will 1n recording simultaneously receive electrical impulses corresponding to the same original sounds, and in reproducing the magnets will simultaneously and separately give rise to electrical impulses corres onding to the two magnetic records to whic said magnets are applied, which im ulses will be transformed into audible soun( s.
My invention also comprises details of construction' by which improved results are secured, as will be more particularly pointed out and claimed.
Reference is hereby made to the accomofwhich, i
Figure 1 is a plan view of a telegraphone constructed in accordance with my mvention. Fig. 2'1s a side elevation of the same. f
Fig. 3 is a section on line 3-3, of Fig. 2. Fig. 4 is a plan view ofthe machine with the pivoted frame which carries the up er magnet and feed screw broken away. ig. 5 1s a section on line 5;-5, of Fig. 4, and shows the u per frame carried upon its hinge and move so as to occupy a vertical position. Figs. 6 and 7 are detail views of the clutch mechanism for actuating the lower feed screw, the clutch being in normal position, wherein the said screw will not be operated. Figs. 8 and 9 are views similar to Figs. 6 and 7, and show the clutch members in position for actuatin the feed screw. Fig. 10 is a detail side e evation of the mechanism for startin and stopping the machine.
. In a the 'views,.corres onding parts are designated by the same re erence numerals.
l The machine illustrated comprises a cabinet 1, which incloses a driving motor 2 and supports the base or bed plate 3 of the mator 2 is provided with a grooved pulley 5 over which asses a belt 6 which also passes over a simi ar pulley 7 carried by a horizontal shaft 8 which is journaled in a bearing 9 formed integral with the base 3'. This be t is sufficiently loose as to normally sli over the pulleys and 7, and a belt tightening device shown in` Figsl and 10 is provided, which operates to tighten the elt whenever it is desired to operate the telegraphone from the driving motor. This mechanism comprises a grooved idler 10 mounted on a pin or shaft l11, which is jourynaled in bearlngs 12 carried at the ends of the arms 13, the latter being pivoted on a pin 14 carried by brackets or lugs 15. A
lever member 16 is pivoted at 17 to bracket 18 and is pivotally connected at 19` to a link 20. One end of the link 20 is pivoted at 21 to the arm 13 and is also `pivot'ed at 22 to the lower end of the 4rod 23 for operating the clutch member, which will be described later. The upper end of the lever, 16 is pivotally connected at 23 to a yertical rod 24, the upper end of which is `pivoted at 25 to a lever arm 25EL carried by a rock shaft 25b and actuated by a lever 26 having a handle 27. It is evident that a movement of the said handle toward the left, Fig. 10, will depress the rod 24 and thereby carry the-idler 10 against the belt 6, tightening the same, so as to enable it to transmit the movement of the pulley 5 to the pulley 7, and at the same tnne the rod 23 will be given an upward movement which will cause it to operate the feed screw clutch 28.
The horizontal shaft 8 is provided at one end with a worm 29 which engages a worm wheel 30, carried-on the lower end of a vertical shaft or spindle-31. This s indle is journaled in a bearing 32 carriedlby the base 3. The up with a ead 32 which is adapted to support the steel record disk a, a clamp 33 being applied to the upper surface of -said disk, and
eing adapted to coperate with the head 32 for holding the disk a as by a central screw (not shown). The vertical-spindle 31 is provided with a worm 34, which is formed with four threads, each-consisting of one convo-l lution, whereby eachrevolution of the worm will advance the worm Wheel 35, a distance represented by four of its teeth of which there are twenty. The Worm gear 35 is integral with a sleeve 36 which is loose upon the horizontal feed screw shaft37, the latter being journaled lin bearings 38 and 39 formed integral with the -base 3. One end of the sleeve 36 is formed with a flange 40 which carries a in 41. Upon the in 41 is pivoted a curve dog 42, and a smal spring 43 is connected at its respective ends to the pins 44 and 45, the former being carried by the end ofthe dog '42and. the latter by the flange 40, as shown. The spring 43 tends l tion shown in er end, of the spindle 3l is provided to move the do upon its ivot from the posi- Figs. 6 and) 7 to that shown in Figs. 8 and 9 so as to cause the nose 46 to enter one of the notches 47 of the clutch member 48, which is keyed to the shaft 37. Such a movement of the dog is, however, impossible when the parts occupy the ositions shown in Figs. 6 and 7, asthe she l 49 incloses the dog 42 and prevents the end 50 thereof from moving outward. The shell 49 is sleeved upon the shaft 37, and is rovided with a pin 51 which engages an inc med slot 52 formed in the shaft 37. The upper end of the operating rod 23 is pivoted at 53 to an ear 54 carried by shell 49, whereby the upward movement of said rod 23 will impart a rotary movement to said shell, and said movement will, by reason of the engagement of the pin 51 with the slot 52, cause the shell to be moved away from flanges 40 and dog 42, or towards the left in Fi 5, so that it assumes `the position shown infig. 9. In this manner the end 50 of the do 42 is liberated and the spring 43 is enabed to throw the dog into locking engagement with the clutch member 48, and thereby cause the actuation of the screw shaft 37. A dwnward movement of the rod 23 of course moves the shell 49 in the opposite direction or towards the flange 40, causing its engagement with the end 50 of the dog 42, the surface of which is beveled, as shown in Figs. 7 and 9, which configuration enables the shell 49`to move the dog on its pivot, thus withdrawing the nose 46 from lockmg engagement with the' notch 47 of the clutch member 48, and placing the resilient member 43 under tension. As there are iive of the notches 47 s aced around the clutch member 48 at equalp intervals, it follows that the screw shaft 37 can begin its rotation only when the spindle 31 and disk a occupy a given position. Hence, the magnets carried by the traveling carriages to be later de scribed, will always track the same path of the disk a., and it is immaterial what position the screw shafts 37 and 70 originally occupy as they will remain stationary until the disk a arrives in proper position with respect to the .said magnets.
' The screw shaft 37 is formed with a screw thread 55. The latter is in operative engagement with a carriage 56, which is given a uniformlyl progressive movement across the lower surface of the record disk a when the said screw is rotated. This carria e is supported at its rear by the screw sha t 37, and
Aat its forward end by a tr-ack 57, the ends of vwhich are'secured by screws 59 to uprights 58 formed upon the base' 3. The forward end of the carriage 56 is provided with a rod 60 which is para el to the front edge of the track A57, and carries at' each end a guide roller 61 which bears against the said edlge of the track 57. Any numbe1\of record magnets ma be carriedby the carriage 57, and I have s own a-single recording or reproducin magnet 62 and an obliterating magnet 63. pon the end of the screw sha yon t 37 and bethe bearing 39 is a screw gear 64. This gear meshes with andis 'adapted to ldrive Va similar 'gear 65 carried by a countershaft 66 Vat right an les to theshaft 37. 'The shaft 66 is journa ed in bearings 67 formed integral with the base 3 -and carries at one end a 'spur vgear 68. The shaft 66 acts as a hinge pin for,v
the frame 69, which carries the upper feed screw'shaft 7 0' journaled in bearings 71 andV Adownwardly extending lu s 74 which are When it is desired to elevate the hinged upon the pin 66; T e free end of the .frame 69 1s provided with a foot -75 which is vadapted to rest upon an upri ht 76 lformedintegral with the base 3, `and t ere is a lockv ing device consisting of a lever 77 having a pair of cam surfaces 78-and pivoted at79 to av mk 80 which ispivoted at 81. to the-upright. 76.- The foot 75 is hollow'ed out as shown at 82 to receive the cam' surfaces 78 of the locklmg lever 77, by which means the upper frame 69 1s tightly locked in operative osition. rameA 69 into 'the position shown in Fig. 5, all that is necessary is to release the locking lever 77 from the foot 75 vand turn the frame', 69 on its hinge 66, the gear 73 remaining in mesh with the gear 65, and readily permitting such piv- 4 otal motion of the frame 69.
A traveling carriage 83- is in o erative .en-
gagement with the screw 84 o the upper screw shaft 70 and the forward vend ofsaid carriage is supported by 'a track 85 similar to track 57 and supported by members 86 de-` pending from the frame 69. A rod 87 havmg guide rollers88 for engaging the forward edge., of theA track 85 is secured to the carriage 83 which is also provided with as, many recording magnets as is' desired, and I have shown onev vor reproducing magnet 89' and an obliteratmg magnet 90 carried thereby. A spur gear 91 is carried by a stud 92 which-.is
appliedto the frame 69 and said ear. 91
meshes with the gear Q68.- A hande. 93 Iis applied to gear 91 and' the-same .provides-1a ready-means for operating the two vfeed screw shafts independently of. the driving motor and clutch 28 for bringing' the magnet carriage 56 and 83 into any.des1red positionv with respect to the surface of the record `medium a.
The operation-of the machine is as lfollows: In case i't'is desired tov make a record upon thesteel disk a, the latter is v clamped^ in-position upon the table or head 32 carried by the vertical spindle31 and the recording magnets 62 and 89 are connected either-in' Amultiple or in Seas with each other and a@ connected with the usual telephonie transmitter,and the magnet carriages 56 and 83 are caused to assume their proper ositions, that is, one maybe at the eXtreme e ge.' of the record disk and the other near the center thereof as shownin Fig. 2. The operator then moves the lever 26 so as to .cause the idler 10 to bear against the belt 6 and tighten the same, and the drivi motor 2 through the shaft 4, pulley 5, and elt 6, causes rotation of the pulley .7, shaft 8 and worm 29. The engagement of the worm 29withrthe worm gear 30 causes rotation .of the vertical spindle 31 and thereby of the record disk a at uniform s eed. Simultaneously with this movement o the idler 10, the o erating rod 23 has .been moved upward an causes the parts of the clutch 28 to assume the positions of Figs. 8 and 9, whereb the worm 34 and clutch members rotate t e screw shaft 37, and the latter through the gearer 64, 465 and 73 causes a rotationA of the screw shaft ina direction o posite to that ofthe screw -shaft 37. The result is that the gre'ssive movement at 'a orm speed transverse to the ldirection of movement of .the-surface of the record disk a, one carriage moving from the center towards 4the periphery of the disk and the other movmg simultaneously vand at the same rate of sl eed from the periphery towards the center.
bviously, the .parts of the record surface which arlpasslng the pointsof the two 100 magnets be moving at different rates 'of speed, but the s eed of one added to the speed of the ot er will remain constant,
since as one is increased bythe movement of onemagnetfrom the center towards the 105 periphery, the other will be decreased at exactly the same rate by'movementof the other maglpet from the periphery towards the center, ereby, 'although the s eed ofthe surface which influences cris each magnet is either constantly increasing" or decreasing, the sound record produced isv of uniform strength throughout,'and when reproduced give sounds of uniform .l strength throughout its length. When itis '115 desired to stop the operation of the machine,
the lever `27 is moved towards the right (Fig. 10) and the belt 6 thereupon is loosened and does not transmit-power, and the members of the clutch 28 automatically 123 return to their initial positions. The operatidn of reproducing is exactly similar to that ofrecordin requmng merely e substitution of a te ephonic receiver in circuit with the magnets-*instead of a ansmitter.
Having now described invention, what Iclaimis: n e -1. In an apparatus for magnetically recording or repro ucing sound, the combination of a plurality of magnets electrically connected 13;;
magnet carriages 56 and 83 are 'ven a pro- Y uenced by 119 in the same telephonie circuit, and a record surface moving past both lof'said magnets, the magnets being located where the surface speeds are different.
2. In an apparatus for magnetically recording or r roducing sound, a pair of magnets electrica y connected in the same telephonic circuit, a record surface moving in proximity to both of said magnets, said surface having` parts moving at different rates of speed, and means for progressively shifting one magnet with respect to said surface from a faster moving part to a slower moving part, and for simultaneously and progressively shifting the `other magnet from a slowermoving part to a fastermoving part.
3. In an apparatus for magnetically re- A cording or replroducing sound, a pair of maging simultaneously in o posite directions;
5. In an apparatus or magnetically recordingor reproducing sound, a pair of magnets m a common tele honic circuit, a record medium of substantia width traveling at a high rate of speed past the poles of said magnets,` and means for progressively shifting said magnets transversely with respectto the traveling record surface, said magnets acting j upon opposite fac'esof said record medium and moving simultaneously in opposite directionss 6." In an apparatus i for magnetically recording or re roducing sound, a pair ofmagnetselectrica y connected in the same telephonic circuit, and a record disk in proximity to both of said magnets, the magnetsacting upon opposite faces of the disk and being \.capable of occupying positions wherein they .areat different distances from the center of the'disk.
7. In an apparatus for magnetically recording or re roducing sound, a pair of magnets electricallly connected inthe same teleho'nic-c'ircuit,a rotary record disk in proxunity to both of said magnets, and means for progressively shifting said magnets across thesur-face of said: disk simultaneously in opposite directions.
8.. .In' fan j apparatus for magnetically l recordingor repoducing sound, a pair of magnets-'electrica y connected in the same tele- :imityto bothof' said magnets, the magnets honicfcircuit, ja rotary record disk in prox-' a magnet carrie by each of said carriages,
anda pair of feed screws for imparting a progressive movement to eachgof said carriages, and to cause said carriages to move simultaneousl in opposite directions.
10. `an apparatus of the character described, the combination of a base, a rotary support adapted to carry al record medium,
a carriage carrying a magnet and movable transversely with respect to the record, said magnet being situated above the record medium, `a carriage carrying a magnet situated below the record medium and movable transversely with res ect to the record, and means for causing sai carriages to travel simultaneousl in opposite directions.
11. n an apparatus of the character described, a base, a rotary support adapted to carry a record medium, a carriage applied to said base, meansfor imparting a progressive movement to said carriage, a frame )ivoted to said base, a carriage applied to sai frame, and means for imparting a progressive movement to said second carriage.
12. In an apparatus of the character described, the combination of a base, a rotary support adapted to carry a record medium, a pair of traveling carriages, a feed screw for operating one ofrsaid carriages, a second feed screw for operating the other carriage, -and a connection whereby one feed screw is driven by the other.
13. In an apparatus of the character described, the combination of a base, a rotary support adapted to carry a record medium, a palr of traveling carriages, a feed screw for operating one of said carriages, a second feed screw for operating the other carriage, a countersha t whereby one feed screw is driven by the other, and `means independent of either of said feed screws for operating said countershaft.-
14. In an apparatus of the character described, the combination of a base, a rotary support adapted to carry a record medium, a pair of traveling carriages, a feed screw for operating one-of said carriages, means for driving said feed screw, a countershaft at right angles to said feed screw and geared thereto, and a second feed screw parallel to the first feed screw for o erating the other carriage, said second feed) screw being also geared to said countershaft. y
15. In an apparatus of the character described, the combination of a base, a rotary support, a carriage applied to said base, a
feed screw for imparting a progressive movement to said carriage, a frame hinged to said base, a second carriage applied tov said frame, a vfeed screw for moving the same, and means for mechanical/ly connecting one feedv screw with the other.
16. In an/apparatus of the character described, the combination of a'base, a rotary support adapted to carrya record medium, a travelin carriage, a feed screw for operating the same, means for driving said feed screw, and means for operating said feed screw indepe dently of said driving means.
1 In an apparatus of the character described, the combination of a base, a rotary 4support ada ted to carry a record medium, a
carriage an feed screw applied to said base, al countershaft geared to said feed screw, a frame hinged on said countershaft, and a second carriage and feed screw applied to said frame, said second feed screw being geared to said countershaft.
\ sponding with t'wo magnetic records ofthe same sounds, one of said records consisting of magnetic eects spaced most closely at the pacted or dense toward its end.
' In an apparatus, of the scribed, the combination of-a base,a rotary 4beginning of the rec'ord and gradually spread-` ing out towards its end, and the. other record f beginning with the mo'st-widel spaced mag' neticeffects 'and being gradua ly more com# 20. In an apparatus`- of the character described, the combination of a base, a rotary vsupport carried thereby,l normallyinactive means for driving. said support, av traveling carriage, means for progressively feeding said carriage, .means including a clutch fordriving said carriage feeding means, and means for simultaneously rendering active the rota support driving means and for 'op' eratingt esai clutch. 1
character desupport carried thereby, 4a traveling carriage, means including a clutch'for rogressivel feeding said carriage, means inc a be tl .for driving said -rotary support, and means,
- -4 for simultaneously tightening saidbelt and operating said clutchi.
2 2. In .an apparatus of thecharacter dcscri-bed, the combination of a base,l arotary.
j support adapted to, carry a record medium,
meansfor driving said support comprising a shaft, a traveling carriage, means for feeding said carriage comprising a clutch member 'loc -a carriage applied *to saidframe and means geared'to said `shaft and so arranged that the clutch member operates only when the shaftl is in one definite position.
23. In an apparatus of the character described, the combinationof a base, a rotary support adapted to carry a recor'd medium, means for driving said support comprising a shaft and wormcarried thereby, a gear engaging the said worm, and a clutch member connected to said gear, the arrangement being such that the clutch member operates only v when the shaft is in one definite position. i
'2.4. In an apparatus of the c aracter de# scribed, the combination ofi-a base, a rotary support adapted to carry a record medium, a f e screw, a carriage sup orted at vone end by said feed screw vand at t e -other end by a horizontal track, and apair of guide rollers carried by the said carriage in engagement with the forward edge of said track.
25. In an apparatus of the character de' scribed, the combination of a base,- a rotary support adapted to carry a record medium, a frame pivoted to said base, a feed screw and traveling carriage carried by the said frame, and means supported by said base for driving said feed screw.
26. In an apparatus support adafted to carry a record medium, a lcarriage app ied to said base, means for imof the character de-' scribed, the combination of a base,'a` rotary .parting a progressive movement to said car` 'ria e, aframe pivoted to s aid base, means for g said frame against pivotalmovement,
for im arting a progressive'movement tosaid secon carriage. 4 v.
27.4 In an apparatus of the character described, a base, a rotary support adapted to ycarry a record medium, a carriage applied to said base, a frame pivoted to said i ase and having a de endiifvr foot 75`formed'with a recess 82, an pivoted to saidbase.,
28. In a telegraphone,
the'ebitmaiion of -a plurality of magnets electricallyconnected iii-.the same telephonie circuit, and' rec ord surfaces moving simultaneously at different l speeds ast the magnets.
29. an apparatus for. magnetically. recording or reproducing sound, vthe combination o a pluralityof-telegraphone magnets,
electrical connections thereto, and '-a record surface moving past both -of said magnets,
`the magnets being'located Where the surface speeds are different. y
30. In an apparatus for-magnetically recordin or reproducing sound, a pair ofrtelegrap one magnets, electrical connections thereto, a record surface moving in .proximity to both the said magnets, said surface having parts moving at differentiates of-A speed, and means for progressively shifting from a one mafgnet with respect to the'said surface aster moving part to a slower moving iso part, and for simultaneously' 'and progresslvely shifting the other magnetfrom a slower moving part to a faster movin part.
31. In an apparatus for magnetica ly recording or reproducing sound, a pair of telegraphone magnets, .electrical connections thereto, and a record disk in proximity to both of said magnets,- the magnets occupying positions wherein they are at dilerent distances from thecenter of the disk.
32. In an apparatus for magnetically recording or reproducing sound, a pair of telegraphone magnets, electrical connections thereto, g a record medium of substantial width traveling at a high rate of speed past the poles of said magnets,` and means for progressively shifting said magnets transversely with respect to the traveling record surface, said magnets moving simultaneously in opposite dlrections.
33. In a telegraphone,` the combination of a pair of magnets, electrical connections thereto, magnetic records of the same sounds moving simultaneously at diii'erent speeds past the two magnets, the record travelln at the greater speed consisting of more wi ely spaced magnetic effects than that traveling at the slowers eed.
In Witness wiereof, I subscribe my signature, in the presence of two witnesses.
HARVE REED STUART. y Witnesses:
WILBUR H. THOMPSON, LOUIS WALTERS.
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2498746A (en) * 1944-12-19 1950-02-28 Joseph B Walker Magnetic sound recording apparatus
US2511837A (en) * 1950-06-20 Combined facsimile transmitter recorder
US2519592A (en) * 1947-12-23 1950-08-22 Daphne Invest Trust Device for the magnetic recording on, and reproducing from, diskshaped sound carriers
US2610257A (en) * 1949-12-22 1952-09-09 Warner Bros Magnetic record volume control
US2632061A (en) * 1947-06-07 1953-03-17 Brush Dev Co Apparatus for producing variable width magnetic recordings
US2690340A (en) * 1948-12-02 1954-09-28 Emi Ltd Sound recording or reproducing apparatus
US2816167A (en) * 1951-08-22 1957-12-10 Daphne Invest Trust Telephonograph system and apparatus and method
US2840642A (en) * 1951-11-15 1958-06-24 Armour Res Found Magnetic transducing assembly
US2986606A (en) * 1955-02-28 1961-05-30 Cambridge Instr Co Inc Recording with audible and visible monitoring
US3042755A (en) * 1955-11-17 1962-07-03 Texas Instruments Inc System for magnetic recording
US3409746A (en) * 1964-04-02 1968-11-05 Ampex Magnetic disc recording and reproducing machine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2511837A (en) * 1950-06-20 Combined facsimile transmitter recorder
US2498746A (en) * 1944-12-19 1950-02-28 Joseph B Walker Magnetic sound recording apparatus
US2632061A (en) * 1947-06-07 1953-03-17 Brush Dev Co Apparatus for producing variable width magnetic recordings
US2519592A (en) * 1947-12-23 1950-08-22 Daphne Invest Trust Device for the magnetic recording on, and reproducing from, diskshaped sound carriers
US2690340A (en) * 1948-12-02 1954-09-28 Emi Ltd Sound recording or reproducing apparatus
US2610257A (en) * 1949-12-22 1952-09-09 Warner Bros Magnetic record volume control
US2816167A (en) * 1951-08-22 1957-12-10 Daphne Invest Trust Telephonograph system and apparatus and method
US2840642A (en) * 1951-11-15 1958-06-24 Armour Res Found Magnetic transducing assembly
US2986606A (en) * 1955-02-28 1961-05-30 Cambridge Instr Co Inc Recording with audible and visible monitoring
US3042755A (en) * 1955-11-17 1962-07-03 Texas Instruments Inc System for magnetic recording
US3409746A (en) * 1964-04-02 1968-11-05 Ampex Magnetic disc recording and reproducing machine

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