The sliding metal strip at the bottom is for zeroing all the dials. Teeth can be seen sticking up from it. The Addometer was very popular and together with competitors such as the Lightning …

Here is a video where I demonstrate my Addometer, and show the mechanism. The Reliable Typewriter & Adding Machine Company seems to have started in the early 1920s, and sold …

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This eight-wheeled stylus-operated non-printing adding machine has plastic wheels and a metal frame. The first wheel is red and has eight holes near its edge for adding fractions.

6 days ago · A vintage Addometer made by the Reliable Typewriter & Adding Machine Co. of Chicago. This handsome brass mechanical instrument made it easier to add and subtract …

The Addometer is a small, handheld, stylus operated adding machine that was produced in large quantities during the first half of the 20th century. The machine consists of a set of 8 digit …

The Addometer was made by the Reliable Typewriter & Adding Machine Company from 1927 until the 1950s. It is an 8-digit dial adder with a built-in stylus and clearing mechanism.

Frank Baldwin based his calculating machine on the invention of Gottfried Leibniz, the German mathematician and philosopher who used a collection of pinwheels and stepped cylinders …

Addometer; an early, mechanical calculator made to add, subtract and multiply. Manufactured in Chicago by the Reliable Typewriter and Adding Machine Co between 1900 and the 1960s.

The machine was made by the Reliable Typewriter & Adding Machine Company of Chicago, Illinois. The instrument was purchased by Smithsonian curator Audrey B. Davis from Greybird …