. Le mécanisme moderne, présentant les derniers progrès dans les machines, les moteurs, et la transmission de puissance, étant un volume supplémentaire à la cyclopedia de la mécanique appliquée d'Appletons . l'introduction de fours améliorés pour la récupération de ces sous-produits, et les fours de manydifferent, conçus à cette fin, ont été utilisés. Le retard des fabricants de coke des États-Unis dans l'introduction de fours impromptus est inexplicable, car les flammes des hauts des fours à ruche qui illuminent la nuit de skybv dans la région de Connellsville sont un rappel constant de l'actuel gaspillage m

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. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . the introduction of improved ovens for the recovery of these by-products, and manydifferent kinds of ovens, designed for this purpose, have come into use. The tardiness of the coke manufacturers of the United States in introducing improvedovens is inexplicable, as the flames from the tops of the beehive ovens which illumine the skybv night in the Connellsville region are a constant reminder of the present wasteful methodsof coke manufacture. The greater first cost of the improved ovens is undoubtedly one of thereasons which has delaved their introduction, and it is also feared that, although the cokemaile bv them mav be of good qualitv, there may be a prejudice against it. as it lacks the sil-verv appearance of the Connellsville coke. The Hon. Carroll D. Wright, United States Com-missioner of Labor Statistics, in his report, Cost of Production ; Iron, Steel. Coal, etc. (1890), gives the average cost of producing one ton of coke in 30 establishments in the United States9 130 COKE-OVEXS.. as follows: coal. $1, 219; labor, $0, 357; officials and clerks, $0, 028; supplies and repair^$0, 058; taxes, $0, 005: total. $1, 067. The average ainouiit of coal necessary to make one ton(2, 000 lbs.) of coke was 8.110 lbs. With these figures the results obtained with the improvedovens described in the following paragrajihs may be compared: The Coppee Cokn-Oirn, which is extensively in use in Europe, is designed for cokingfinely divided coal. Thev are usually built in series of ;50 or 40, and are worked in i)airs.The ovens, which are 80 ft. long, 18 in. wide, and 4 ft. high, have each 28 vertical flues lead-ing from the top through the partition-wall common to two ovens, to horizontal flues thatpass longitudinallv beneath the chambers. In these horizontal flues the gases from a freshlycharged oven mix with those

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