Machine Design
A hollow saddle key is

A taper key which fits in a key way of the hub and is flat on the shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
A taper key which fits half in the key way of hub and half in the key way of shaft

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Machine Design
When the belt speed increases

Power transmitted increases
Power transmitted increases to a maximum value and then decreases
Power transmitted decreases
Power transmitted remains the same

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