Chapter CXIII: Section 29: Cushioning

(_See also p. 72._)

=2118. Rubber pad or buffer.=

=2119. Cushion tyre= for road wheels.

=2120. Cushion tyre, pneumatic.= The resistance in this tyre is increased by compression of the enclosed air by a portable pump.

=Duplex pumps= are cushioned at each end of the stroke by trapping
part of the exhaust steam by the piston closing the port.

=Air vessels= are used to cushion the action of a pump, both on the
delivery and suction.

=2121. A spring piston= is used for the same purpose.

=Pads or cushions of rubber,= felt, leather, &c., are used as buffers
to cushion blows.

=Shaw & Spiegle’s steam towing machine= provides an elastic steam
cushion which yields to prevent overstraining the cable, the engine
then running backwards under the strain, but winds up again as the
strain goes off, thus paying in and out to suit the motion of the
vessel.