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.
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Section 30.—DRILLING, BORING, &c.
(See also [p. 72].)
See Expanding reamers, [Nos. 2149], [2151].
See Expanding cutters, [Nos. 2069], [2070], [627].
See Expanding auger, [Section 36].