[1248]. Round grooved chain pulley.

[Larger plate.]

[1249]. Double grooved chain pulley; prevents the chain twisting.

[1250]. Pitched chain snug pulley or sprocket pulley. The pitch of snugs should be slightly longer than the chain, to allow for wear and stretching of the chain.

[1251]. Chain sprocket wheel, for long link chain at slow speeds.

[1252]. Sprocket wheel, for long flat link pitched chains.

[1253] & [1254]. Sections of rim showing single and double links.

[1255]. Sprocket wheel, for Ewart’s patent pitched chains. See Chains &c., [Section 11].