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2. Pinwheel calculator - Wikipedia

   en.wikipedia.org/wiki/Pinwheel_calculator

   A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...

3. Cancellation (insurance) - Wikipedia

   en.wikipedia.org/wiki/Cancellation_(insurance)

   The return premium is generally calculated using a wheel calculator, a type of circular slide rule or an online version. [1] The return premium is calculated by calculating the unearned premium and then subtracting any unpaid premium and penalty for early cancellation.

4. Odhner Arithmometer - Wikipedia

   en.wikipedia.org/wiki/Odhner_Arithmometer

   After Odhner's death, in 1905, his sons Alexander and Georg and son-in-law Karl Siewert continued the production [3] and about 23,000 calculators were made until the factory was nationalized during the Russian revolution and was forced to close down in 1918. This makes the Brunsviga arithmometer, with its 1892 start, the longest-lasting Odhner ...

5. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

6. Slide rule - Wikipedia

   en.wikipedia.org/wiki/Slide_rule

   The pocket-sized Hewlett-Packard HP-35 scientific calculator was the first handheld device of its type, but it cost US$395 in 1972. This was justifiable for some engineering professionals, but too expensive for most students. Around 1974, lower-cost handheld electronic scientific calculators started to make slide rules largely obsolete.

7. Pascal's calculator - Wikipedia

   en.wikipedia.org/wiki/Pascal's_calculator

   The calculator had spoked metal wheel dials, with the digit 0 through 9 displayed around the circumference of each wheel. To input a digit, the user placed a stylus in the corresponding space between the spokes and turned the dial until a metal stop at the bottom was reached, similar to the way the rotary dial of a telephone is used.