See also Section 70.
=808. Plain or solid pedestal.=
=809. Half bearing,= sometimes used without a cotter.
=810. Half bushed bearing,= having a half brass on the lower side only.
=811. Chambered long bearing.=
=812. The ordinary double brassed pedestal= or plummer block; sometimes
made with the cap and joint of brasses at an angle of 45° when the shaft
is subject to horizontal thrust. Numerous modifications of this bearing
exist.
=813. Slot bearing= for rising and falling spindle.
[Illustration: 792.-813.]
=814 & 815. End thrust bearings.=
=816. Sliding bearing,= with vertical or horizontal traverse.
=817. Double ~V~ bearing= to accommodate different sizes of shafts.
=818. Vertical shaft footstep.=
=819. Vertical pivot.=
=820. Horizontal pivot= and set screw; the screw should have a lock nut
to prevent it being worked back by the motion of the spindle.
=821. Conical neck,= usually with steel bush.
=822. Spherical footstep,= to allow the shaft to sway out of the
perpendicular.
=823. Horizontal bearing,= allowing the shaft to run out of line.
=824. Balanced bearing,= to bear the weight of a light shaft, and placed
between the fixed bearings.
=825. Self-adjusting bearing= for line shafts, with ball and socket
movement.
=826. Ball and socket bearing= for vertical spindle, allowing
considerable variation from a right line.
=827. Horizontal thrust bearing,= with multiple flanges and double
brasses, each capable of separate adjustment; used for screw shafts in
steam-ships.
=828. A form of pedestal,= with the cap provided with end joggles to
prevent looseness.
=829. Trunnion bearing,= for oscillating cylinders, &c. The steam is
conveyed through the bearing, which has a stuffing box and gland to
prevent leakage.
=830 & 832. Swinging support= for a shaft, having a sliding bevil gear
or other motion upon it which has to pass the swinging support; used for
lathe sliding gear, overhead travellers, &c.
=831. Ball and socket centre= for car bogies, &c.
=833. Pedestal with side adjustment= for the brasses by taper keys and
screw adjustments.
Bearings running under water are generally lined with strips of lignum
vitæ and require no lubricant.
So-called self-lubricator bearings are in use, lined with strips of
patent composition metal.
[Illustration: 814.-833.]
=834. Centre bearing,= with annular grip, for a heavy centre piece or
car bogie.
=835. Centre bearing,= with allowance for some amount of oscillation.
=Coupled bearings.= No. 671.