[Larger plate.]

[792] & [793]. Winding engines are provided with indicators on the principle of [No. 744]. The travelling nut has a pointer whose position on a vertical graduated scale shows the position of the cage in the pit.

Vertical scale indicators are also employed to show the level of water in tanks, reservoirs, &c. See [No. 1730].

Water tube indicators are employed to show the level of water in boilers, &c., as also gauge cocks fixed at various heights in the boiler.

Section 45.—JETS, NOZZLES, AND INJECTORS.

[794]. Straight jet, for long distances.

[795]. Short jet.

[796]. Rose jet, for spreading.