[1233]. The shaft runs in the V between two rollers as last described.
[1234]. Roller or ball bearing. The friction is least when the rollers have end pivots to run in loose rings so that the rollers are kept apart and do not rub each other in revolving.
[1235]. Hydraulic bearing, the shaft being sustained by water (or preferably oil) pressure.
[1236]. Vertical shaft, with cone rollers.
[1237]. Vertical shaft, with ball bearing.
[1238]. Vertical shaft, flanged and coned for cone rollers.
[1239]. Ordinary swivelling castor.
[1240]. Ball castor.