The Artizan . romdocks to pump well; F F F F, dischargeculvert, leading to large float; G, dis-charge culvert from chain pumps; II H,the wells; III, the cloughs; K, thecoal space in boiler house; L, the chim-ney shaft; M, culvert leading into greatfloat; N, passage between the two wells;O, sluice valve in the same. The boilers are five in number—3-1 , and 5ft. 6iu. diameter, with a singleflue 3ft. 2in. diameter. Each of thesemay be termedja 30ft. horse boiler, butshould be able to supply steam for at leastindicated horse; and as the highest duty that one of the rotary pumpscan do is to
The Artizan . romdocks to pump well; F F F F, dischargeculvert, leading to large float; G, dis-charge culvert from chain pumps; II H,the wells; III, the cloughs; K, thecoal space in boiler house; L, the chim-ney shaft; M, culvert leading into greatfloat; N, passage between the two wells;O, sluice valve in the same. The boilers are five in number—3-1 , and 5ft. 6iu. diameter, with a singleflue 3ft. 2in. diameter. Each of thesemay be termedja 30ft. horse boiler, butshould be able to supply steam for at leastindicated horse; and as the highest duty that one of the rotary pumpscan do is to raise cubic feet of water 36ift. in one minute, whichrepresents a work of 250 indicated horse, there should be no lack ofsteam power. The engines themselves, we are inclined to think, mightwith advantage have been a little heavier, to enable them to do this workwithout throwing considerable strains upon their working cost of this machinery was, we understand, about £7,000. {To It continued.). ON WORK AND J. W. NYBTB01C, Acting Chief Engineer, I From the Journal of the Franklin Institute.) In a previous article on Physical Work, a continuance of the gamesubject was promised, extending I I the combined action of gravity andmechanical force, the manuscript of which has since been lying on theshelf, awaiting some criticisms on the part already published. In the great confusion which now involves the subject, it was deemednecessary to advance cautiously, having Bach step of progress thoroughlydiscussed as far as it went; for experience admonishes us, that any reform,however simple or important, cannot be introduced and accepted withoutdue deliberation. The liberal criticisms of Professor De Volson Wood, of Universityof Michigan, however much at variance in doctrine with my own, were perused with unaffected satisfaction, and should the interest in the sub-ject evinced by him be followed by others, we might hope that valuablelight would ultim
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