B.M. Cole


A 1908 hand-held computer

Horse Power Computer for Steam, Gas & Oil Engines Golding, Henry Albert. London: Charles Grffin & Co., 1908.

Horse power computer 2058

A rotating logarithmic computer [sic, i.e. calculator] consisting of three moving circular varnished card pieces of graduating size turning around a brass rivet on a back-board, 6.5 x 6.5 inches, 16 x 16 cms. Together with the original 12 page illustrated instruction manual.

The calculator and its accompanying manual are both in fine near-immaculate condition, as issued, with tissue guard, in their original white cardboard box, the box itself being a touch bowed.

The Unique or Rare Shop item image 2058a

Henry A. Golding, the designer of this calculator, was the author of "The Theta-Phi diagram practically applied to steam, gas, oil, and air engines" first published in 1898. In 1906, he submitted a complete specification patent application for "Improvements In Power Computing Slide Rules For Steam and Other Engines" (Original Patent Application Number 8,196). This computer, marked "Golding's Patent", is almost certainly the fruit of that application.

The calculator was designed primarily for steam engines but enables calculations for two-stroke gas and oil engines. 

Although a Copac search shows only a single instance of this early computing machine recorded as appearing in the holdings of major British and Irish libraries, I am fortunate to be able to offer for sale more than one original example of this rare item..

Item reference RS-2058

Price: £95 (GB pounds sterling) plus postage and insurance as below
- First class postage, fully insured, within the UK: £5
- Airmail postage, fully insured, outside the UK: £12

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