Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

[⅟₂ × (P1 + P2)] + Pc
P1 + P2
⅟₂× (P1 + P2)
[(√P1 + √P2)/2]²

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Machine Design
A compound belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
None of these

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