Show I. I How ow to Figure Out Horse Power in Auto Engine nine II T 0 find the horsepower r of your motor car square the diameter of the cylinders multiply multiply mul mul- it by the number of cylinders cyl cyl- inders and divide it by 21 This is the rule mull adopted by the Society of Automobile Engineers Engineers Engineers Engi Engi- but it is not absolutely accurate te only being so at a definite piston speed In the new Essex for instance the rating under this formula would be only y about 18 horsepower while wItHe the engine actually develops more than 50 horsepower |