. Journal. Fio. 1. Fence per ton, 1915. for prices between 14s. 6d. and 18s. per ton, theheat value paid for falls away from the regidarcurve represented by the dotted line, or, in otherwords, if coals were sold on a regular calorificscale, instead of following the lajvs of supply anddemand, we should expect to pay less than thepresent market value between these limits of coals in this area of price include unscreened Vol. XXXV.,N9. PATERSON—FUKL VALUES. 11 steam coals, wnshecl slacks, and small luits, all ofwhich arc among t he most commonly used classes inlarRO works. Fig. 2. s
. Journal. Fio. 1. Fence per ton, 1915. for prices between 14s. 6d. and 18s. per ton, theheat value paid for falls away from the regidarcurve represented by the dotted line, or, in otherwords, if coals were sold on a regular calorificscale, instead of following the lajvs of supply anddemand, we should expect to pay less than thepresent market value between these limits of coals in this area of price include unscreened Vol. XXXV.,N9. PATERSON—FUKL VALUES. 11 steam coals, wnshecl slacks, and small luits, all ofwhich arc among t he most commonly used classes inlarRO works. Fig. 2. shows a similar curve constructedat the end of 191;? and reproduced from an articlei>y the author in The Shipbuilder (\ol. x., ). In this the falliufr off in value occursbetween the prices 83. Od. and lis. ! Fio. 2. ctKo per ton, 10i:i. Tables II. and III. show how the Absolute HeatValues of coals No. li and 7 in Table I. are arrived«t. The figures given are those obtained whenthese coals arc used to heat a frame-bendingfurnace and are very similar for a hand-fired boiler. Table II. Coal No. 2. One ton coal has net cal. value of 29,314,000 Pence. •Coal at 18s. 3d 219 Firing labour 36 Moving coals and clinker 8 JSepaiia to grates 2 265 ^ 110,700. it becomes worth while to bri(|uette it andmix the briing about .js. per ton ofscreenings, including labour and tar l)inder, andalso interest on capital. Tables IV., V., and how th absolute licit values of the foundrycoke, screened breeze, and the mixture of screenedbreeze and l)ri(£uettes are o))tained. In Tnble \.the screenings from the breeze are assumed to beworthless and tlirown a«ay. n. Poiinilry coke. One ton coke has net lal.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
