360
EXPLANATION OF THE PLATES.
shaft connected with the hot water cistern and cylinder casing, the ribs or webs of
which are disposed in the direction of the strain : there are many more fanciful and
pleasing forms, but certainly none so mechanical or so well adapted to the purpose.
T, Injection pipe through side of vessel,—-y, bilge injection.—To be used in the event
of the vessel leaking to any extent, in which case the river injection would be shut
off, and the bilge one opened. This is an appendage which has till lately been over
looked by other makers, but a very necessary one, as by such means about four
gallons per horse power per minute might be withdrawn by injecting from the
vessel.
U is a longitudinal section of the boiler; V, the grate; and W, the flues; y, safety
valves enclosed in safety pipe, and perfectly inaccessible to the engine-man for the
purpose of applying extra weight to endanger the boiler. This description of valve
was used by them as far back as 1814, in a vessel fitted on the Tyne, consequently
three years previous to the examination before the Committee of the House of Com
mons for some such precaution, h h, Blow-out pipes and cocks; i i i, feed pipes; k
&c., hold-down bolts, occasionally cased with brass to prevent corrosion.
PLATE XXXII,
This plate represents, with similar reference letters, a transverse section of the same
splendid steamers, the Red Rover and City of Canterbury, shewing on the left the
cylinder, and on the right the crank end of the engine, with the paddle wheels, main
beams for support of paddles, stays, &c., &c,