propeller pitchometer

Propeller pitchometer in a box with three metal wedges and three angle of degree plates. Heavy wooden body with level which has three interchangeable brass plates for laying out different pitch propeller blades. No 1 Plate has a scale marked in increments of 5 degrees from 5 upto 60. No 2 plate has a scale marked in increments of 5 degrees from 5 upto 45. No 3 plate has a scale marked in increments of 5 degrees from 5 upto 35. On the back of each plate are scales showing the pitch in feet.

A pitchometer is a tool engineers use to measure the pitch, or angle, of propellers.