with circular or helical scales

Introduced: September 1968

Last revised: January 2006

Full Title

Hand-manipulated computing devices > Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales > characterised by construction > with circular or helical scales

Classification Context

Section:: PHYSICS
Class:: COMPUTING OR CALCULATING; COUNTING
Subclass:: ANALOGUE COMPUTERS