Scientific Instruments > Calculating

Fowler's Circular Slide Rule Calculator Type ‘Long Scale’

Item#: SCI389

SOLD

 

Fowler & Co. in Manchester made this pocket calculator. It was designed for engineers; draughtsman and science students with several advantages over straight slide rules. The calculator consists of two dials and two rotating knobs. These dials are synchronized with a rotating radial hairline cursor to solve problems with recipes, pie, roots, Log, sin, cos, tan as well as routine arithmetic. This calculator is 6 cm (2 3/8") in diameter and ruggedly made for traveling with a heavy duty red felt lined thick metal case. On the inner lid is a brass disk stating: ‘Fowler & Co. Calculator Specialists Manchester England’. The case is marked on the outside Fowler’s Calculator.