Non-Decimal Calculators

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Angle/Time (Minutes/Seconds) Calculators

Astro Addiator
Astro Addiator

Astro Addiator

This stylus-operated Addiator is designed for addition and subtraction of angles in degrees-minutes-seconds or time in hours-minutes-seconds, where the number system uses sexagesimal units (i.e. based on 60).  Note the maximum value '5' in two of the columns.

The machine is double-sided, with one side for addition and the other side for subtraction.  In the photographs it is displaying the angle 123 45' 12.34" or the time 123hrs 45min 12.34sec.

84 x 128 x 6 mm (3.3" x 5.0" x 0.25").

This version manufactured about 1938 - 1957.

It is called 'Astro' since it would have been useful to Astronomers.

Vintage Calculators

© Text & photographs copyright Nigel Tout   2000-2017  except where noted otherwise.