Machine Design
In levers, leverage is the ratio of

Load arm to the effort arm
Effort arm to the load arm
Mechanical advantage to the velocity ratio
Load lifted to the effort applied

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Machine Design
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating shearing resistance to the crushing resistance of the rivets
None of these
Equating tearing resistance of the plate to the shearing resistance of the rivets

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