Calculator Resources

Home > Calculator Resources

Videos of Calculators on YouTube

There are some interesting and educational videos on the YouTube site showingf old calculators in use. These can give a good understanding of how these machines actually operate.


General Calculator Videos

Two videos from Paul R. Schmidt:
"Vintage Calculator Tour":
A video that comprehensively explains the characteristics and use of 26 calculating devices in Paul's collection, "from ancient history until the present".  This especially shows the development of hand-held electronic calculators from the early 1970s to the present, with Paul giving us the benefit of his personal experiences in using them.

"Vintage Calculator Tour, Part 2":
Covers Corvus models 310 & 311, Hewlett Packard HP-35, and especially the Canon Canola 161S desktop calculator with Nixie tube display.


"The History Of Calculators Documentary" (from a Japanese perspective):


"The Calculator Wars: A video history of Japan's electronic industry":


"The Pocket Calculator Wars":



Videos of Mechanical Calculators

On Youtube, a search for "Mechanical Calculator" will reveal many more videos, some much better than others.  Here are some of the better ones:

"How the Arithmometer Works" (stepped-drum mechanism):


"Ingenious Pocket Mechanical Calculator" (using an Addiator):


"How Pinwheel Calculators Work":


"The Original Odhner (Vintage Calculator)" (using a pinwheel calculator, includes finding a square root):


"Hot to use and operate an antique mechanical calculator" (a pinwheel calculator):


"Inside a mechanical calculator" (a pinwheel mechanism):


"How the Comptometer Works":


"How the CURTA Works":


"Square root of 2 on the pepper grinder" (i.e. on a Curta):


"1956 Friden STW 10 Electro-Mechanical Calculator Restoration":


"1956 Friden STW 10 Mechanical Calculator Demo":


"Facit TK Mechanical Calculator Demo": Added Apr 19


"The FACIT CA1-13 Calculator":
Shows the incredibly complicated mechanism, crammed into such a small space of this type of machine, at work.


"How 10-key Adding Machines Work":
An animation which explains how the Remington-Rand Model 73A adding machine works.  The design of the Model 73A is similar that of most 10-key mechanical calculators produced in the 1940's and 50's.


Videos about the Comptometer on Youtube include:


The Millionaire calculator has several videos:  Added Apr 19


MADAS calculator videos: Gérald Saudan has a site on The Millionaire and MADAS calculators at which has videos of parts of the mechanism operating.  Especially interesting is a video of opening a machine in order to repair or clean the various parts.  Although these are YouTube videos they are embedded in the pages where, if necessary, there are descriptions of the operations being performed.  Added Apr 19


"The Unitas Calculator":
"The Unitas is a mechanical calculator based on the Arithmometer of Thomas de Colmar. Its unique feature is that it has two output registers, each on its own movable carriage. It was made by Ludwig Spitz & Co in around 1912."  Added Apr 19


"The British Calculator - BriCal":
"The British Calculator, or BriCal, is a simple adding machine for British currency. It was invented by Herbert and Mabel Dickinson in 1905. This one was made in about 1907 by T.J. Marshall & Co."  Added Apr 19


The Youtube channel "ID of ED" at features several videos where Ed investigates the cause of an electrically-driven Monroe CST-8 being jammed.  He takes the novel approach of substituting a stepper motor for the original AC motor to help the investigation by allowing the machine to be precisely controlled at low speed.  Added Apr 19



Videos of Electronic Calculators


"Old Sharp Calculator Commercial check out how big they are". Very interesting old advertisements for calculators have started to appear on the YouTube site as video clips. For instance there are videos of the Sharp EL-8 (there called the Sharp LC-8) at and, where it is "the world's smallest electronic calculator".


"ANITA Mk8 vintage electronic desktop calculator demonstration" (operating with covers removed):


"An astonishing old calculator":
Shows the internals and operation of the Friden EC-132New Apr 19


"Vintage Friden EC-132 Calculator from 1965":
Shows the operation of the Friden EC-132.


"42 year old 1967 vintage Casio calculator still working" (shows some of the problems when trying to use a very old Casio AL1000 electronic calculator) :


"Compucorp 322G Calculator Teardown":


"TSI Speech+" (Dale Hill's video of the first speaking calculator in operation):

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2019  except where noted otherwise.