Machine Design
An open 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 same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Open belt drive transmits more power than crossed belt drive
Open and crossed belt drives transmit same power
Power transmission does not depend upon open and crossed types of constructions
Crossed belt drive transmits more power than open belt drive

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Machine Design
Turn buckle has

Left hand threads on both ends
No threads
Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends

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