Fig. 105. — Instrument used for measuring the scallops. The scallop is passed 

 down the triangle until it touches on both sides, where the figures indicate its 

 length in millimeters (25.4 millimeters to an inch). The instrument possesses the 

 advantage of speed and accuracy for quick measuring, as many as 1,200 measure- 

 ments being possible in an hour. 



