Chapter CXIX: Section 38: Friction Gear
(_See also p. 88._)
=2170. Carriage driving gear.= The carriage wheel bears upward against the driving spindle which drives it by friction, or the latter is forced down into frictional gear with the carriage wheel by loading or by springs.
=2171. Friction, spring clip,= for giving tension to cotton thread passed between the convex discs.
=Leather covered pinions= geared with plain rimmed wheels or discs.
These should always have the pinion as driver, otherwise the pinion is
liable to wear in fits and become useless.
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The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purposeChapter CXIX: Section 38: Friction Gear
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