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

[147]. Scroll cam.

[148]. Crank and lever, intermittent or continuous motion.

[149]. Piston, or valve rod and lever motion.

[150]. Similar movement, but with anti-friction roller on end of lever.

[151]. Rod and lever reciprocating motion, with anti-friction roller.

[152]. Similar movement, with a socket forged in the rod and the end of lever rounded to allow for angular motion.

[153]. Diagonal disc cam, or “swash plate.”

[154]. Motion for belt shifting with dead travel at half stroke. This allows the lever to move a certain distance on each side of the centre without moving the belt shifting bar.

[155] & [156]. Sectors and bent lever, used on Cornish engine valve gear.

[157]. T lever valve motion, used in rock drills, some forms of steam engines, &c.