US809019A

US809019A - Device for calculating horse-power.

Info

Publication number: US809019A
Application number: US24349705A
Authority: US
Inventors: Eugene Mcclellan Scoville
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-01-31
Filing date: 1905-01-31
Publication date: 1906-01-02
Anticipated expiration: 1923-01-02

Description

No. 809,019. PATENTED JAN. 2, 1900. E. M00. SGOVILLE.

DEVICE FOR CALCULATING HORSE POWER.

APPLIGATION FILED JAN.31, 1905.

5 will )6 5311! L'Ig. 1

A TTORMEYS UNITED STATES PATENT OFFICE.

EUGENE MOCLELLAN SCOVILLE, OF IVAIPAH U, TERRITORY OF HAIVAII.

DEVICE FOR CALCULATING HORSE-POWER.

Specification of Letters Patent.

Patented Jan. 2, 1906.

Application filed January 81, 1905. Serial No. 248,497.

To M111 whont it Wtcty concern:

Be it known that I, EUGENE MGULELLAN SoovILLE, a citizen of the United States, and a resident of VVaipahu, Oahu, Territory of Hawaii, have invented a new and Improved Device for Calculating Horse-Power, of which the following is a full, clear, and eXact description.

My invention relates to a planimeter, in combination with a support therefor especially adapted for the operation of the planimeter and provided with a new and improved sliderule particularly designed for calculating horse-power.

The principal object of my invention is to provide means for calculating horse-power from an indicator-card accurately, conveniently, and rapidly.

Further objects of the invention are to pro- Vide a portable support for a planimeter having a surface for supporting the moving parts thereof and also for holding the indicatorcard and the slide-rule, to provide a planimeter of improved construction, perfectly balanced and capable of being readily set in position to be operated, and also to provide a slide-rule which, while capable of being operated like an ordinary slide-rule, can be used for computing horse-power from mean eifective pressure and other necessary data with but two settings.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure l is a plan showing a preferred form of my invention. Fig. 2 is an end elevation thereof, partly in section. Fig. 3 is a sectional view of a preferred form of planimeter constituting a portion of my invention, showing parts in section; and Fig. 1 is a rear view of a portion of the slide-rule.

A base or support 10 is provided with a iiat surface adaptedv to receive the moving parts of a planimeter and to afford a proper surface for them to operate upon. Secured about in the middle of this surface on the support is an anchor-plate 11, having a longitudinal slot 12. This slot is adapted to receive a projection 13 upon a carriage 14. This projection is provided with a central point or indicator 13. The carriage is provided with a rod 15, upon which is adjustably mounted a tracing-point 16. This tracing-point is mounted in a bearing 16 and is secured in adjusted positions by a thumb-screw 16 The body of the planimeter, which has heretofore been designated as a carriage, is provided with a pair of springs 17. These springs are adapted to engage a movable shaft or rod 18 and are provided with bearings 19 for that purpose. The shaft 18 is adapted to move longitudinally and rotate in these bearings. Upon one end of the shaft is asmooth-surfaced wheel 20 of enough weight to balance the device and to serve as a balance-wheel for it. Upon the other end the shaft is provided with a wheel 21, having a sharpened edge for engaging the surface upon which the Wheels roll and preventing the longitudinal motion of the shaft except by the rotation of the wheel upon its sharpened edge. The shaft is provided with an indicatingmark 22, adapted to show upon a scale 23, held by the springs 17, the mean effective pressure represented by the indicator-card operated upon. The support is provided with clips 24 for securing the indicator-card 25 thereto.

Upon one side of the support three scales A, D, and E are provided The first of these scales is divided so as to represent mean ef fective pressures, as is indicated on the drawings by the letters M. E. P. It is also provided with the letters H. P. at the top for an obvious purpose. The scale E indicates diameters of the cylinder and is so designated. Between the scales A and D is located a groove 26, in which fits a slide 27. On one end of the slide it is provided with divisions or graduations representing the stroke, as is indicated at the bottom in the drawings, and upon the other end the graduations represent revolutions per minute, as is indicated at the top. This slide is capable of moving longitudinally in the groove 26. The slide is also provided with a longitudinal groove 28, in which is mounted a rider 29. This rider is provided with an indicating-mark 30, and the scale Eis provided with a gage-point 31, the purpose of which will be explained. This gage-point is preferably located at a point indicating twenty-two and one-half on the scale E. 26, but being mounted thereon will move with it when the slide is moved. The slidefiule can, as usual, be provided with a gage 32. The rear of the slide 27 is provided with gradations, as shown in Fig. 4:, similar to those of the standard Mannheim scale, so that by removingthe rider 29 and inverting the slide the slide-rule can be used in the ordinary manner.

The rider can be moved along the slide ;matical calculations.

It is to be understood that the principal object to be attained by this invention is the complete calculation of the horse-power from the indicator-card and other data known by any person whether skilled in mathematics or not and without the employment of any mathe- The manipulation of the slide-rule is effected by only two settings, Which, it is believed, has not heretofore been accomplished.

The operation of the embodiment of the in vention which is illustrated in these drawings will now be described. The indicator-card 25 is placed under the clips 24 in an obvious manner. A scale 23, corresponding to the inclicator-spring, is placed on the planimeter under the springs 17. The

points

13 and 16 are then set to the extreme length of the diagram on the indicator-card and the thumb-screw 16" tightened. The planimeter is then placed in position with its fulcrum-pin 13 in the slot 12. The mark 22 on the axle or shaft is set to Zero on the scale 23. The paper is preferably pricked to show the starting-point of the tracing-pin, and the diagram is traced in a righthand direction until the starting point is reached. The indicating-mark 22 will then indicate the mean effective pressure directly upon the scale 23. By setting the

points

13 and 16 six inches apart and using a scale having sixty divisions to the inch areas in square inches can be directly computed on the planimeter instead of mean effective pressure. After obtaining the mean effective pressure with the planimeter the slide 27 of the rule should be so set that the stroke in inches as represented on the lower half of the slide is opposite the calculated mean efiective pressure upon the scale A. The rider 29 is then moved along the slide until its indicating-mark 30 coincides with the gage-point 31, the slide of course remaining stationary during this adjustment. The slide is then moved, carrying the rider until the latter is opposite the cylinder-diameter in inches on the scale E. Then on the scale A, opposite the revolutions per minute as represented upon the upper half of the slide, thehorse-power can be directly read. If in extreme cases the reading isolf the board, the rider can be set to half the cylinder diameter and theresu lt multiplied by four. As an example, taking an engine twenty by forty-two, M. E. P. seventy-five pounds, R. P. M. sixty, set the point 4.2 on the slide to 75 on the lower scale A. Then without moving the slide set the rider to the gage-point on the scale E. Then move the slide carrying the rider with it until the indicating-mark on the rider coincides with the numeral 20 on the scale E, and on the scale A opposite the reading on the upper part of the slide read the resultnamely, three hundred horse-power.

1 If the diameter of the cylinder for any desired horse-power is required, set the stroke to the M. E. 1 set the marker to the gage-point 31, set the revolutions to the horse-power deameter on the scale E. It will be noticed that the scale D is notemployed in these calculations; but it is retained because upon inverting the slide a regular slide-rule can be obtained.

iVhile I have illustrated and described a particular embodiment of my invention, itwill be readily understood that the latter is not limited to that embodiment, but may be constructed in many other forms, and that many from the spirit of the invention.

Having thus deseri bed my invention, 1 claim as new and desire to secure by Letters Patent 1. A calculating device comprising a pair of scales, one being provided with a stationary gage-point, and a slide having a scale adapted to register with one of the first-mentioned scales and provided with a rider slidably mounted thereon and adapted to register with the other stationary scale and with the gagepoint.

2. The combination with a support,o'l. a sliderule thereon having two stationary scales, and a slide provided with a s ale and with a rider slidably mounted thereon and adapted to register with one of said stationary scales.

3. A calculating device, comprising a pair of scales, one representing mean efl'ective p ressures in horse-powers, and the other representing cylinder diameters, the second scale being provided with a stationary gage-point, a slide having a scale adapted to register with the first-mentioned scale and provided with a rider slidabl y mounted thereon and adapted to register with the second stationary scale and with the gage-point.

A. A device for calculating horse-powers, comprising a stationary scale having divisions representing mean eflective pressures and horse-powers, a second stationary scale having divisions representing cylinder diameters and a gage-point among said divisions, and a slide adapted to move along both of said firstmentioned scales and provided with a scale representing revolutions per minute and length of stroke and having a rider slidably mounted thereon adapted to register with the second of said stationary scales and with said gage-point.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EUGENE EUC'IJELI'IAN SCOVlhhE.

Vitnesses:

F. B. ns'r, F. l/V. MAnNIImn.

sired, and opposite the marker read the dimodifications may be made without departing