Belt for Sprocket Drive Made of Brass Strips
Being unable to purchase a small driving chain for sprockets made by cutting out every other tooth in gears taken from a clockwork, I used a brass strip, properly punched, and found it satisfactory. The strip was .005 in. thick and the points where the holes were to be punched out were indicated by dividers set from the gears. I made a punch from a nail leaving a small center on it as shown and grinding the end to an oblong shape. I used a piece of sheet lead as a die, on which to punch the strips. The marks made by the dividers provided spots on which to set the center of the punch, making the result quite accurate.—Edward M. Davis, Philadelphia, Pa.