• Contents: ..
• 1 Air bed
• 1 Rotating disc with cross bar
• 1 Multiple pulley
• 1 Release mechanism
• 2 S-shaped hooks 1.00g
• 1 S-shaped hook 2.00 g
• 1 Set of weights (2x 12.5 g, 2x 25 g, 2x 50 g)
• 1 Compressor for connection to mains
• 1 Silicon tubing with by-pass valve (not illustrated)

Product information: ..
A small rotating disc with a protractor scale supports a cross bar to which weights can be attached. The disc is supported by a bed of air in which its axis is centred. A driving weight is suspended from a hook at the end of a string that is passed over a single pulley on one side and a multiple pulley on the other. The rotation is very slow and can be measured using a stopwatch by hand. Alternatively, a digital timer may be used. This can be started by a mechanism that is supplied with the kit and halted by a signal from a laser reflection sensor when the wheel passes through angle zero.