US172270A

US172270A - Improvement in calculators for manufacturers of picture-frames

Info

Publication number: US172270A
Authority: US
Publication date: 1876-01-18
Anticipated expiration: 1893-01-18

Description

Z Sheets-Sheet 1. B. KILBOURN,

CALCULATORS FOR MANUFACTURERS 0F PICTURE-FRAMES.

N0.17Z,Z70. Patented Jan. 18,1876.

% 7 u-izgg III-I535 2 Sheets-Sheet 2.

CALCULATORS FOR MANUFAC U Ens 0F PICTURE-FRAMES. No.17Z,Z70. Patented Jan.18,1876.

UNITED STATES PATENT QFFICE.

BEEOHER KILBOURN, or BIGHFIELD srntnes, n w'YoRK.

IMPROVEMENT IN CALCULATORS FOR MANUFACTURERS 0F PICTURE-FRAMES.

Specification forming part of Letters Patent No. [72,270, dated January 18, 1876; application filed August 6, 1875.

To all whom it may concern Be it known that I, BEEGHER KILBOURN, of the town of Richfield Springs, county of Otsego and State of New York, have invented a scale for the ready and accurate computation of the amount of thelinear andboard measure feet of molding in picture-frames; and I hereby declare that the following is a true and full description of my invention, reference being had to the accompanying drawing as a part of this specification, in which Figure 1 is full, and Fig. 2 a partial, plan vlew.

I construct my scale in the following manner: Upon a suitable card, A, Fig. 1 of the drawing, I print the scale of inches and parts of inches in the subdivisions of the arc B, which figures indicate the width of molding used in the construction of the frame, the amount of stock or molding in which is to be ascertained upon the same card A, and in a corresponding curve under and adjacent to said are B I construct and equally subdivide the are C, in

whose subdivisions I place the consecutive numbers, which represent and indicate the dimension of the frame in its length or breadth in inches. Now, upon the movable card D, and at its outer circular edge, I print the consecutive numbers in equal subdivisions, and similar spaces to those above and below mentioned, which are and numbers E indicate and represent the dimension of the frame in its opposite direction, and adjacent to and beneath or inside of said last-mentioned are E I print the are F, with its consecutive numbers in similar subdivisions, indicating (the larger figures) feet and (the smaller figures) inches, and representing the total number of feet in any frame to be constructed. I now attach the card D at its center to the center of the circle of the arc B of the main card A by means of an eyelet or rivet, H, and puncture the hole G as a means of moving the card D around its center H.

The operation of myinvention is as follows: I find on the edge of the movable card D, in the are E, the length of theend of the frame. I place this figure under the figure in the are 0 representing the length of the side of the frame. Now, in the arc B I find the width of the molding, and directly under this on the arc F I find the total in inches, and the number of feet to be added is found at the next large figure at the left of the inches. For example, a frame eighteen by twenty inches of three and one-fourth inch molding, wanted the total length of molding in the frame. Placing 18 on the outer edge of card D, under 20 on are 0, I find under 3% of arc B, 6 in arc F, and to the left of such 6 I find 8-that is, there are necessarily used in constructing such frame, waste'at the corners included, a strip of three and one-fourth inch molding eight feet and six inches long. I also construct inside the arc F the blank arcs I I shown in the drawing, for the purpose of inserting a list of prices for the molding, and also for the glass commonly used with pictures, in order that their cost can be computed at the same time as the quantity of molding required.

My invention saves time, and makes an error impossible, if the scale is used according to the directions printed thereon.

I claim- The combination of a fixed and a movable chart, the one bearing scales of one of the necessary dimensions of a frame, and also the width of the molding, and the other chart bearing a scale of the other dimension of the frame, and one or more series of results, all separated by suitable indexial lines, substantially as and for the purpose set forth.

BEEOHER KILBOURN. Witnesses: H. O. WATSON, A. R. ELWooD.