Jean_LAMESCH_Sliderules_Collection_BOX_JL10

1750_PICKWORTHS_Power_Computer

1750_PICKWORTHS_Power_Computer

PICKWORTHS Power Computer for Gas and Oil Engines: small 160mm long British (Manchester) cardboard slide rule with 2 independent central sliders. Allows for instance to find the Horse Power from Cylinder Diameter, Stroke Length, mean Eff. Pressure and number of Strokes per Minute. From 1875-1899. More here and here.