. The street railway review . upyeven less space when used as cut-ofT couplings. Having no pro-jecting surface or parts to catch the air when in operation, thewindage resistance is negligablc. The greatest advantage claimedof this form of clutch over others is that it is self contained—theaction and reaction being within the clutch itself, and conse-quently there is no resulting end thrust upon the shaft bearingsand no additional friction load due to the operation of the clutch. It has been suggested that in many instances a clutch of this de-sign could be substituted for the fly-wheel, thus p
. The street railway review . upyeven less space when used as cut-ofT couplings. Having no pro-jecting surface or parts to catch the air when in operation, thewindage resistance is negligablc. The greatest advantage claimedof this form of clutch over others is that it is self contained—theaction and reaction being within the clutch itself, and conse-quently there is no resulting end thrust upon the shaft bearingsand no additional friction load due to the operation of the clutch. It has been suggested that in many instances a clutch of this de-sign could be substituted for the fly-wheel, thus permitting the useof magnetic clutches without great increase in the cost or weightof the engine units. Fig. I shows what is believed to be the largest magnetic clutchever built. It is 100 in. in diameter, and is designed to transmit The current is carried to the clutch coils through coiUact ringsupon the side of the clutch, and carbon brushes held by insulatedbrush holders, the electrical connections being simple and easily. Fir,. 1—100-IX. MAGNETIC CLI:TCH. 3,000 h. p. at 150 r. p. m. This is one of three clutches now inuse connecting the engines and generators in the central stationof the Imperial Electric Light, Heat & Power Co., at St. Louis, aview of the equipment of which is shown in Fig. 2. The experiencewith this plant demonstrates that this form of clutch is applicableto the large size units now being installed for power station pur-poses, whereas the ordinary friction clutch becomes unwieldy andunsightly after passing the 500-h. p. size.
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
