What is another word for mechanical calculator?
Pronunciation: [mɪkˈanɪkə͡l kˈalkjʊlˌe͡ɪtə] (IPA) 
A mechanical calculator is a machine that performs mathematical operations without the use of electricity or other external energy sources. Synonyms for mechanical calculator include adding machine, comptometer, and arithmometer. An adding machine is specifically designed to add numbers, while a comptometer is a more advanced version that can perform addition, subtraction, multiplication, and division. Arithmometers are the most complex mechanical calculators, capable of performing a wide range of mathematical operations and even storing results. Other synonyms for mechanical calculators include calculating machines, tabulating machines, and differential analyzers. Although they have largely been replaced by electronic calculators, mechanical calculators were once a vital addition to any office or scientific research facility.
