. Locomotive engineering : a practical journal of railway motive power and rolling stock . andin what degree different oils lessen fric-tion, or what the lubricating qualitiesof the oils submitted to trials are, and en-ables a person in a few minutes to ascer-tain with certainty the relative values ofwhat he means to purchase and to com-pare the stock with the sample he hasmade trial of. A is a cramp with its screw for fixingthe instrument; P is a pulley for drivingthe arbor, D is a piece of brass screwed onthe top of the arbor, for holding the oilto be tested. The top of the arbor passesthrou
. Locomotive engineering : a practical journal of railway motive power and rolling stock . andin what degree different oils lessen fric-tion, or what the lubricating qualitiesof the oils submitted to trials are, and en-ables a person in a few minutes to ascer-tain with certainty the relative values ofwhat he means to purchase and to com-pare the stock with the sample he hasmade trial of. A is a cramp with its screw for fixingthe instrument; P is a pulley for drivingthe arbor, D is a piece of brass screwed onthe top of the arbor, for holding the oilto be tested. The top of the arbor passesthrough the socket of the upper plate;those plates are turned perfectly true andflat, but do not touch each other; this isregulated by a small screw on the top ofthe socket of the upper plate, which canbe screwed down so as to prevent theplates touching each other, only leaving athin film of oil between. As much oilmust be put into the cup of the under plateas will just appear above the upper plate;the motion will cause the superfluous oilto fly off. F is a pin fastened to the plate, 1McNAUGHTS INDICA fOR. six or eight grooves varying about one-eighth of an inch each; for the conveni-ence of finding the desired speed and forimmediate application it is supposed tobe fixed on the point of a turning lathespindle, the cramp being fixed to thelathe rest. The rest will slide out or inso as to answer the driving band and thedifferent sizes of the pulleys. When the oil to be submitted to trial isput between the plates and the apparatusis set in motion, the sliding weight maybe shifted above the graduated lever tillit stands at some point, for instance, withgood sperm oil; if it is brought to sucha speed as to indicate 30 upon the scale,then neat-foot, olive and gallipolic oilswill be about 60. To judge of the correctness of the in-strument, let a trial be made of equalparts of different oils; suppose one of of 20, and another at 40, it is evident thatthe tenacity of the former is bu
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Keywords: ., bookcentury1800, bookdecade1890, bookidlocomotiveen, bookyear1892
