Manual teaching calculator

Abstract

An arithmetic teaching device consisting of a rod having hand movable spaced collars slidable thereon and having sequentially spaced numbers therealong corresponding to the collars whereby the numbers indicate visually the arithmetic calculation of preceeding manipulated numbers.

What is claimed is: 
     
       1. A manually operable arithmetic calculating device, having in combination a single rod,   a stop member at each end of said rod,   said rod having .[.thirty one.].   
     
     
        .Iadd.a plurality of .Iaddend.rings thereon slidable therealong, said rings being colored with each fifth ring being of a different color to indicate groups of five rings,   numerals on said rod corresponding in number to the number of said rings and respectively appearing to the right of each ring,   an unnumbered length of said rod extending from the last number thereon to provide a space for unused rings, and   said stop member being of a height to elevate said rod on a flat surface sufficiently to move said rings in making calculations.