Untitled record

Application filed April 22, 1882. (No niodc-1.)

To all whom it may concern:

_ Be it known that I, Hermann Wagner, a citizen of the United States, residing at Elizabeth, in the county of Union and State of New 5 Jersey, have invented new and useful Improvements in Apparatus for Teaching Arithmetic, of which the following is a specification.

This in vention relates to a device which, while it serves as a toy, assists in teaching arithmeio tic.

The peculiar construction of my toy, which forms the subject-matter of my invention, is fully pointed out in the following specification.

In the accompanyingdrawings, Figure 1 rep15 resents a front view of the interior mechanism, the face-plate having beeu removed. Fig. 2 is a transverse vertical section of the entire device in the plane x x, Fig. 3. Fig. 3 is a face view of the same. Fig. 4 is a face view of the 2o carrier on a smaller scale than the previous figures. Fig. 5 is a transverse section of the same.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates a box made of wood or any other suitable ma25 ferial, the face-plate or cover B of which is provided with a series of openings, «, over which are placed a series of figures, as shown inFig.3. In this figure I have shown ten openings a, and the figures placed over them run from 1 to 10; 30 but the number of the openingsand the figures placed over them can be changed. For instance, instead of placing the figures from 1 to 10 over the openings a, the figures from 10 to 20, or any other figures, can be selected, and 35 for this purpose I propose to provide transverse slides on which the different series of figures are marked, so that by changing these slides different quantities can be multiplied or divided, as will be hereinafter explained.

In the interior of the box A is situated a rackbar,C, which is guided in a metallic frame, D, and extends down into the hollow handle E of the box A. To this rack-bar is firmly secured a carrier, F, which is made of a flat plate of 45 sheet metal or any other suitable material, provided at its edges with lips δ δ, (see Figs. 4 and 5,) between which the tables G are placed. The sides of the carrier rest upon the sides c c of the box, the cover or face-plate B being ele50 vated above these sides, so as to leave slots d,

Fig. 2, in which the carrier moves, and through which the tables G can be introduced.

Therack-bar G is moved up ordowii by means of pinions e e, Fig. 1, which are geared together with the driving-shaft/, and also with an ar- 55 bor, g. The driving-shaft extends through the face-plate B, and on its outer end is mounted a crank, h, by means of which said shaft can be turned iu either direction. The arbor g also extends through the face-plate, and on its outer 60 end is mounted an index,/which travels over a dial,/ marked on the face-plate. When the crank h is turned in the direction of arrow 1, Fig. 3, the carrier F is raised and the index i turns in the direction of arrow 2. 65

The tables G, which are placed on the carrier F, are marked with different figures, according to the quantity to be multiplied. One of the tables—for multi plication, for instance— is marked with ten rows of figures, as indicated 70 in Fig. 1, the figures in each row being in such positions that they will show through the openings a in the face-plate of the box A as the table containing them is moved up by the carrier F. If the carrier is clear down, the index 75 i points to the figure 10 (or zero) on the dial / Fig. 3. If the crank h is turned in the direction of arrow 1, the carrier is elevated, and when the index i points to the figure 1 on dial j the first row of figures 011 the table G shows 80 through the openings a a, aud so on. When . the carrier is raised to the position shown in Fig. 3 the third row of figures on the table G show through the openings a a, aud the index i points to the figure 3, which, iu this instance, 85 is the multiplier, while the figures 1 2 3 4 5 marked on the face-plate are the multiplicants, aud the products show through the openings a a.

With the driving-shaft/is combined an 90 alarm, H,which is sounded whenever said shaft has completed one revolution, and the shaft/ is geared together with the shaft g in such a manner that the index i travels from one figure on the dial J to the next for each revolution of 95 the shaft/. By the alarm, therefore, the position of the carrier is indicated.

The carrier is divided by a stop, m, Fig. 4, so that one table G can be inserted from one side and another table from the other side; 100

262,191 and in Figs. 3 and 4 I have shown a multipli- J cation-table on one and a division-table on the other side. In Fig. 3 the index i points to the divisor 3, and the figures exhibited through the opening a show 6 divided by 3 equal to 2, 7 divided by 3 equal to 2J-, and so on. From these examples it will be obvious that by the aid of the proper tables addition, multiplication, division, and other mathematical operations can be performed, and if the figures 1 to 10 which are marked on the face-plate B are placed on a slide Instead of marking them directly upon the face-plate, and different slides with different figures are provided, the capacity of my machine can be increased to any desired degree, as already stated.