. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 178 THE CIVIL ENGINEER ANDIARCHITECTS JOURNAL. [May,. Fig. S.—Fire Engine, used by the London Fire Brigade. Longitudinal section,—with the Levers turned up for tnivelling. this also rentJers the cock somewhat difficult to be opened and shut, if the pressure be great; but as a lever of any length may be used, and the kpy, from its perpeudiculnr position, may be loosened by a blow, this objection is, in a great measure, obviated. In figs. 5 and 6, the openings in the street are
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 178 THE CIVIL ENGINEER ANDIARCHITECTS JOURNAL. [May,. Fig. S.—Fire Engine, used by the London Fire Brigade. Longitudinal section,—with the Levers turned up for tnivelling. this also rentJers the cock somewhat difficult to be opened and shut, if the pressure be great; but as a lever of any length may be used, and the kpy, from its perpeudiculnr position, may be loosened by a blow, this objection is, in a great measure, obviated. In figs. 5 and 6, the openings in the street are large enough to admit of the levers for opening the cock to be fixed, that no mistake may occur from the lever being mislaid; but with those at the British Museum, it was not thought necessary to have fixed levers, as a crow- bar, or anything that could be introduced into the eye of the spanner, would open them. On the application of manual pomr to the working of Fire Engines, In the application of manual power to the working of fire-engines, the principal object is, to apply the greatest aggregate power to the lightest and smallest machine; that is, suppose two engines of the same size and weight, the one with space for 20 men to work, throws 60 gallons per minute ; the other with space for 30 men, throws 80 gallons in the same time ; the latter will be the most useful engine, although each man is not able to do so much work as at the former. The reciprocating motion is generally preferred to the rotary for fire engines. Independent of its being the most advantageous movement, a greater number of men can be employed at an engine of the same size and weight; there is less liability to accident with people unac- quainted with the work, and such as are quite ignorant of either mode of working, work more freely at the reciprocating than the rotary motion. To these reasons may be added, the greater simplicity of the machinery. Various sizes of engines, of different degrees of
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