US732072A - Combined ruler and adding device. - Google Patents

Description

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APrLIorrIon FILED 0012.3, 1901.

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H. L. HASKELL & J. A. MITCHELL. COMBINED RULER AND ADDING DEVICE.

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UNITED STATES Patented June 30, 1903.

PATENT OFFICE.

HENRY L. HASKELL AND JOHN A. MITCHELL, OF LDINGTON, MICHIGAN.

COMBINED RULER AND ADDING DEVIC.

SPECIFICATION forming part of Letters Patent No. 732,072, dated J' une30, 1903.

Application filed October 3,1901. Serial No. 77,477. (No model.)

To a/ZZ whom t may concern,.-

Be it known that we, HENRY L. HASKELL and JOHN A. MITCHELL,citizens ofthe United States, residing at the city of Ludington, in the county of Mason and State of Michigan, have invented certain new and useful Improvements in a Combined Ruler and Adding Device, of which the followingis a specication.

This invention relates to improvement-s in combined rulers and adding devices.

The objects of the invention are, first, to provide an adding device which shall be adapted to be combined with aruler or other instrument and not interfere with their use in any manner; second, to provide an adding device which shall be simple and easy to operate and economical to manufacture.

Further objects will vdefinitely appear in the detailed description to follow.

We accomplish the objects of our invention by the devices and means described in this speciiication.

Theinventionis clearlydetined and pointed out in the claims.

A` structure embodying the features of our invention is fully illustrated in the accompanying drawings, forming a part of this specification, in which- Figure lis a detail plan view of a combined ruler and adding device embodying the features of our invention. Fig. 2 is a crosssectional view of the same, taken on line 2 2 of Fig. l. Fig. 3 is a detail plan view of a modified form of our invention.

In the drawings the sectional view is taken looking in the'direction of the little arrows at the end of the section-line, and similar letters of reference refer to similar parts throughout the several views.

Referring to the lettered parts of the drawings, A is a ruler, of Wood or other suitable material. In the upper surface of this ruler A is a groove A. 'On the bottom of this groove are numbers C, printed in columns, the right-hand column in Fig. l of the drawings containing the numbers from O to 110, consecutively, and the left-hand column numbers 90 to 200, consecutively. The numbers in the right-hand column are numbered up, while those in the the slot b".

left are numbered down. Opposite each number is a hole or spot c. We provide a slide B, having upwardly-projecting lugs or ears b, which is adapted to reciprocate in the groove A. This slide is cut away at each side for a space equal to eleven numbers in the groove. It also has transverse slots b on each side opening into the slots or cutaway portions b at opposite ends. On the face of the slide on each sideV and adjacent to the cut-away portions band numberedin directions to correspond with the numbers in the groove are the numbers l, 2, 3, 4, i( 5,77 C( 6,77 (7,77 i 8,77 L( 9, C 0.77 bers are spaced to correspond with the numbers in the groove.

We have described the mechanism in detail and will now describe its operation.

In use the slide Bis moved until the number to which it is desired to add appears in A pointer is then placed in the hole c opposite the figure on the slide which it is desired to add and the slide pushed up to the pointer, when the sum will appear through the slot b". The slots b are of such length that the ends coming in contact with the pointer serve as stops forthe slide. The numbers exceeding one hundred at the top of the right-hand column and those below one hundred at the foot of the left-hand column are for the purpose of transferring'from one column to the other-as, for example, a sum is to be added to ninety-five which will carry it up into the hundreds, the operation is transferred to the left-hand column, the slot in the slide B on the left-hand side will be at 95 and continued in that column. The operation of the modified structure shown in Fig. 3 is the saine. A set of figures D is provided to assist in keeping the record of the hundreds, or a counter Dl is provided to keep the record of the same. The same consists of a numbered disk with pointer, as shown. It is apparent that this may be used with the structure shown in Fig. l.

We have described our invention in detail in the form which we believe to be the most convenient to use and economical to manufacture; but we are aware, however, that it is capable of considerable variation withou departing from our invention.

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on said body portion; and a slide provided with suitable stops adapted to reciprocate in said groove, having consecutive numbers thereon spaced to correspond with the numbers on said body portion, for the purpose specified.

In Witness whereof we have hereunto set our hands and seals in the presence of two witnesses.

HENRY L. HASKELL. JOHN A. MITCHELL. Vitnesses:

ARTHUR M. JOHNSON, EDITH S. DECKER.

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