The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

[2451]. Anti-friction worm gear. The worm wheel has friction rollers running on pins, which gear with the worm.

[2452]. Staple bolt and washer plate.

[2453]. Fang plate washer for wood.

[2454]. Fang plate washer for wood.

[2455]. Sunk set screw, with differential threads, to draw two plates or pieces together.

[2456]. Taper screw, quickly released.

[2457]. Mutilated screw to slide into a nut having corresponding sections of the thread cut away, and to fix by a partial turn. Used for breech-pieces of cannon.

[2458]. Bolt head, with transverse holes, for a plain “tommy” bar wrench.

[2459]. Backlash nut for a square thread screw.

[2460]. Cap nut.