. The steam-engine and other heat-motors. but will always be filled with steam of nearly the sametemperature as that in the cylinder. In the above paragraph many desiderata are pointed out. but I no real evidence or data are given to prove the assertions beyond the evidence of the cut. Catalogues give much valuable informa- j tion. but students should be trained to give only the proper value 1 to the statements they contain for obvious reasons. The piston, 8, is formed from a solid piece of the finest tool- * Quoted from Practical Instruction for Using the Steam-engine Indicator,Crosby Steam-g
. The steam-engine and other heat-motors. but will always be filled with steam of nearly the sametemperature as that in the cylinder. In the above paragraph many desiderata are pointed out. but I no real evidence or data are given to prove the assertions beyond the evidence of the cut. Catalogues give much valuable informa- j tion. but students should be trained to give only the proper value 1 to the statements they contain for obvious reasons. The piston, 8, is formed from a solid piece of the finest tool- * Quoted from Practical Instruction for Using the Steam-engine Indicator,Crosby Steam-gage and Valve Co. 48 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. steel. Its shell is made as thin as possible consistent with properstrength. It is hardened to prevent any reduction of its area bywearing, then ground and lapped to fit (to the ten-thousandthpart of an inch) a cylindrical gage of standard size. Shallowchannels in its outer surface provide a steam-packing, and themoisture and oil which they retain act as lubricants and prevent. Fig Indicator—Cress-section. undue leakage by the piston. The transverse web near its centersupports a central socket, which projects both upward and down-ward; the upper part is threaded inside to receive the lower endof the piston-rod; the upper edge of this socket is formed to fitnicely into a circular channel in the under side of the shoulder of thepiston-rod when they are properly connected. It has a longitudinalslot which permits the straight portion of the wire at the bottom ofthe spring, with its bead, to drop to a concave bearing in the upperend of the piston-screw, 9, which is closely threaded into the lower STEAM-EXGINE IXDICATOK AXD ITS CALIBRATION. 49 part of the socket; the head of this screw is hexagonal and may be turned with the hollow wrench which accompanies the The above paragraph gives some idea of the care used in the design of the piston. The moving parts of an indicator should
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