the driver is stopped or because another source of power increase the speed of the driven. This type of clutch usually uses rollers or balls mounted between an outer sleeve and an inner member having flats machined around the periphery. Driving action is obtained by wedging the rollers between the sleeve and the flats. The clutch is 10 therefore equivalent toa pawl and ratchet with an infinite number of teeth. ic fluid clutch or brake isa relatively new development which has two parallel ic plates. Between these plates isa lubricated ic powder mixture. An ic coil is inserted somewhere in the ic circuit. By varying the excitation to this coil, the shearing strength of the ic fluid mixture may be accurately controlled. Thus any condition from a full slip toa frozen lockup may be obtained. 11
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