. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . lerto the working cylinder in the usual way. and the ex-haust steam from the cylinder was condensed in a coil ofpipe immersed in water, allowed to flow into a hot-well,passed on to the feed-pump of the engine, and forced back into the boiler, thus making acomplete circuit. With constant water-level in the boiler, the steam-pressure was 50 lbs. persq. in. at the start, and it was brought up to this at the end of each
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . lerto the working cylinder in the usual way. and the ex-haust steam from the cylinder was condensed in a coil ofpipe immersed in water, allowed to flow into a hot-well,passed on to the feed-pump of the engine, and forced back into the boiler, thus making acomplete circuit. With constant water-level in the boiler, the steam-pressure was 50 lbs. persq. in. at the start, and it was brought up to this at the end of each trial of three hours dura-tion. In the case of naphtha, a copper coil was fitted inside the steam-space at the upperpart of the same boiler, so that the boiler efficiency should be the same as in the previous ex-periment. Naphtha of 0-G8 specific gravity was pumfied into the coil and vaporized by theheat of the steam. The vapor passed to the engine, worked the same (liston in the cylinder,was led into a condensing coil, passed to a hot-well, and finally pumped back into the coilinside the boiler. Ihe tests made alternately with steam and naphtha gave the following results:. Fig. 10.—Naphtha-engine boiler. Oas consumption in cubic ft. per hour Mean pressure naphtha in coil (lbs. per sq. in.) Mean pressure steam in boiler Mean speed in revolutions per min Tension on brake in lbs Work on brake in foot-pounds per min WORKING age:nt. Steam. Naphtha. 82-20 83-4S .).-,-80 3r;t9 30-07 312-6 5ra-i 1 151 1-222 Thus, with nearly the same rate of gas-consumption, the power obtained on the brake wasin the ratio of about 5:9 for steam and najihtha—that is, the same quantity of heat wasturned into nearly twice as much work by the cxi)ansion of vapor as by the expansion of steamunder the .same conditions. Naphtha, being a complex mixture of various hydrocarbons, evaporates far more rapidlythan water. Proper care must be taken in using the naphtha, as the more volatile vaporsj
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