Scientific Instruments > Calculating

Fowler "Jubilee Magnum" Extra Long Scale Calculator.

Item#: SCI1163

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Fowler "Jubilee Magnum" Extra Long Scale Calculator. - click to enlarge.

This is a circular slide rule made in 1948. The entire scale disk is rotated by turning the top knob. the second knob, rotated a second hairline (in black) while the other (red) hairline is fixed relative to the metal case. This calculator is 9" in diameter and ruggedly made for traveling with a heavy duty felt lined thick leather case. The instrument contain 4 separate scales arranged concentrically on a single dial. Besides the typical multiply and reciprocal scales, it included scales for converting twelfths to/from tenths, meters to yards, Kg to lbs, inch to cm, etc. The original instruction book is included.