Compressed air . Is there any patent onthe apparatus for the dashboards? Mr. Shedd—Yes. there is. Mr. McKenzie—Who owns it? Mr. Shedd—I guess it is pretty nearlyfree. Mr. McKenzie—What do you mean byits being pretty nearly free ? Mr. Shedd—Well, there wouldnt bemuch objection to anybody using it forthese purposes. Mr. Albert F. Sickman—I would like toinquire if you know what the efficiency ofthis compressor is? tion of all classes of machinery bytransmitted power. Among the mostcommon systems of distribution are me-chanical (shaft, rope, belt or chain) ; hy-draulic, pneumatic and electric. The
Compressed air . Is there any patent onthe apparatus for the dashboards? Mr. Shedd—Yes. there is. Mr. McKenzie—Who owns it? Mr. Shedd—I guess it is pretty nearlyfree. Mr. McKenzie—What do you mean byits being pretty nearly free ? Mr. Shedd—Well, there wouldnt bemuch objection to anybody using it forthese purposes. Mr. Albert F. Sickman—I would like toinquire if you know what the efficiency ofthis compressor is? tion of all classes of machinery bytransmitted power. Among the mostcommon systems of distribution are me-chanical (shaft, rope, belt or chain) ; hy-draulic, pneumatic and electric. The me-chanical distribution systems are costlyto install, and somewhat cumbersome;their practical range is but a few hundredfeet. Hydraulic transmission is objectionablefor general use because of the many leaks,and the problem of disposing of the used ? water. Pneumatic transmissions,unless carefully designed, are subject towater-condensation troubles and to in-visible leakage. If proper care is exer-. WORKIXG IX CLOSE QUARTERS. Mr. Shedd—The efficiency has not beenmeasured at this place particularly, but Itook part in several experiments as to theefficiency of the plant of Magog, and thatranged from about per cent, toa little over seventy per cent. The high-est efficiency we obtained was a little overseventy per cent. Applications of Pneumatic Power in theMachine Shop. There was a general tendency duringthe nineteenth century toward the central-ization of prime-movers and the opera- *By R. Emereon, in TTie Engineering Magazine cised to install pipes and joints that donot leak, the practical radius of use (whilenot usually comparable in length to long-distance electric transmission) is veryconsiderable; and in special cases the sys-tem has a number of advantages overelectricity. The relative generating,transmitting and operative efficiency, inshops or works installations, or in smallplants, is not in favor of electricity; al-though the costs of piping and
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