The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

To register wind pressure, barometric variations—rainfall, sunshine, &c.;

To register periodical visits of a watchman or other official, and the hours of such visits;

To register visits to a bank safe.

[2211]. Indicator to register the flow of water by its speed and pressure against a floating ball, which actuates a pencil moving vertically against a paper cylinder which is kept revolving slowly by clockwork.

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Section 45.—JETS, NOZZLES AND INJECTORS.

(See also [p. 102].)

[2212]. Körting’s water jet condenser; requires 3 feet head of condensing water.

[2213]. Spray jet for petroleum, water, &c., with air blast.

Automatic spray jets or sprinklers are constructed to spread or spray water over a considerable area by the force of the issuing current, for extinguishing fires, watering gardens, &c.