. Factory and industrial management. technical papers, but it is still un-settled. It should not be difficult to arrive at some solution of the mat-ter, but I have no suggestions to offer myself upon it. A commercialsolution of the question is very difficult, for buyers do not know ofany other term than horse power, and it would take about one hun-dred years to get one into general use. The question of boiler powercould be very easily settled for boiler makers, or to their satisfaction,by fixing so many feet of heating surface and grate-surface, with agiven height of stack, burning a certain n
. Factory and industrial management. technical papers, but it is still un-settled. It should not be difficult to arrive at some solution of the mat-ter, but I have no suggestions to offer myself upon it. A commercialsolution of the question is very difficult, for buyers do not know ofany other term than horse power, and it would take about one hun-dred years to get one into general use. The question of boiler powercould be very easily settled for boiler makers, or to their satisfaction,by fixing so many feet of heating surface and grate-surface, with agiven height of stack, burning a certain number of pounds of coal persquare foot of grate per hour, said proportions to constitute one horsepower. This would leave the buyer to get the best evaporation thathe could, let the same be more or less. I am afraid, however, thatthere would be as much argument after the adoption of this rating asbefore; the only benefit to the trade would be that boiler makers wouldnot be in the controversy, so I leave the subject where I found THE GROWTH OF ECONOMY IN MARINEENGINEERING. By Walter M. —THE INTRODUCTION OF HIGHER PRESSURES AND COMPOUND ENGINES. In this, the second of Mr. McFarlands valuable articles, the subject is developed fromthe period of the simple engine to the advance in economy which followed the introductionof compounding; the work of s>]ch pioneers as , Loring, Emery, Ishcrwood, and othersbeing discussed. The following papers will deal with the introduction of triple expansion,and the succeeding improvements which have made the modern marine engine capable ofdeveloping a horse-pcwer with one-tenth of the fuel demanded by the early engines andrendered present speeds and capacities possible.—The Editors. IT is almost impossible to draw a sharp line separating- one periodin the growth of the steam engine from another; but for conven-ience this can be done roughly, and we might say that the simple-engine period extended to about 1865 and the
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