[Patented Logarithmic Calculator]. Horse Power Computer for Steam, Gas & Oil Engines. Explanatory Pamphlet & Original Instrument complete in box.
London: Charles Griffin & Co., 1908. First Edition. An original and complete logarithmic calculator, or Computer, designed for solving the numerous problems connected with the power, size and speed of steam engines of all kinds. The calculator has four parts, fastened with a brass rivet, each with a printed scale..... More