Lubricating or inking rollers to evenly cover a flat surface are placed at an angle of about 10° to the direction of motion of the surface to be lubricated or inked.

Large engines are fitted with an oil reservoir, and pipes are led to all joints, bearings, &c., with small cocks for regulation.

[Larger plate.]

Section 52.—LEVELLING AND PLUMBING.

The common spirit level and plumbline are ordinarily employed, as also the surveyor’s telescope and spirit level or “Dumpy.”

[986]. Gravitation level.

[987]. Plumbline and square.

[988]. Water tube level; the tube may be carried a long distance and round corners, &c., in any direction below the water level.

[989]. Spirit level plumbing square.