[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.
Section 70.—ANTI-FRICTION BEARINGS.
(See also [p. 152].)
[2402]. Roller bearings for centrifugal milk separators, &c. The pan is carried on three large rollers running against an inverted cone, as shown.
[2403]. Ball bearing for vertical shaft. By Sir Gabriel Stokes.
[2404] & [2405]. Forms of grooves for ball bearings, running horizontally, showing points of bearing in grooves.
[2406]. Roller bearing for a vertical shaft, with steel balls between the ends of the cone rollers to separate them and reduce their friction.
[2407]. Roller bearing for a door, or other article having a limited travel. The roller runs on the floor, or a rail, and its spindle rolls along the slot, the length of which is proportioned to the travel of the door.