. Factory and industrial management. ngineer-in-Chief, U. S. N., 18841887. Past-President American Society of Mechanical Engineers; associated with Mr. Charles E. Emery in important experimental researches in steam engineering. rotational speeds were possible. Both of those were of benefit in reduc-ing- the cost of power. As has already been mentioned, steam jacketing had been used tosome extent, and with the general use of the compound engine theuse of steam jackets became universal. The benefits derived were notalways obtained, because care was not always taken to keep the jacketswell draine
. Factory and industrial management. ngineer-in-Chief, U. S. N., 18841887. Past-President American Society of Mechanical Engineers; associated with Mr. Charles E. Emery in important experimental researches in steam engineering. rotational speeds were possible. Both of those were of benefit in reduc-ing- the cost of power. As has already been mentioned, steam jacketing had been used tosome extent, and with the general use of the compound engine theuse of steam jackets became universal. The benefits derived were notalways obtained, because care was not always taken to keep the jacketswell drained by the use of efficient automatic traps. The economy tobe derived from jacketing has not gone entirely unquestioned, andvery interesting experiments have been made from time to time to testvarious questions in this connection—notably the proper steam pres-sure to use in the jackets of the different cylinders. It has sometimesbeen deemed advisable not to jacket the high-pressure cylinder, for the ECONOMY IN MARINE ENGINEERING. 53. CHARLES E. EMERY. Mr. Emerys researches in steam engineering in association with Commodore C. H. Loringcontributed most valuable data in connection with compounding and steam jacketing. reason that a certain amount of moisture in the steam there has beenconsidered beneficial; but the fact seems pretty well established thatthe jacket steam pressure should never be lower than the highest steampressure in the cylinder to which the jacket is applied. Two general types of the compound engine were used at first—the tandem, in which the small cylinder was co-axial with the largeone and usually placed above it (a vertical arrangement) ; several ofthe White Star steamers were built with pairs of these tandem en-gines ; the other type was known as the receiver compound engine,because there was an intermediate space between the two cylinders,which permitted placing their cranks at right angles when two cylin-ders or at I20 degrees when three were used, so a
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