Chapter CXXXIX: Section 69: Raising and Lowering

(_See also p. 148._)

=2396. Richmond’s patent balance hydraulic lift.= ~A~ is the lift cylinder, connected openly to the balance cylinder ~B~, which is weighted to nearly balance ram ~A~ and cage. Pressure water is applied to ram ~C~ to raise the load in cage.

=2397. Waygood’s patent hydraulic balance lift.= ~A~ is the lift cylinder communicating with the interior of cylinder and ram ~B~ which are fixed; cylinder ~C~ and ram ~D~ are loaded to nearly balance the cage and ram ~A~, and the load is raised by admitting pressure water to cylinder ~C~.

=2398. Lever and rack lifting motion.= The rack may be held up at each lift by a pawl.

=2399. Rack and lever suspended hoist.= A pawl or brake may be added to sustain the load.

=2400. Spanish windlass.=

=2401. Double hoisting barrels,= geared together; the rope passes round both barrels.

=The “Otis” low pressure elevator= (hydraulic) is worked from an
overhead air accumulator at 80 lbs. pressure, the hydrostatic head
being 40 lbs. There is one descending main pipe connected to a small
tank or close vessel, into which the pumps deliver, and from which the
lift pressure water is taken.