Machine Design
The strap end of a connecting rod of steam engine is joined by

Knuckle joint
Sleeve and cotter joint
Spigot socket cotter joint
Gib of cotter joint

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch

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