[5] Mr. Mushet says, "The greatest produce in iron per furnace with the Black Band and cold blast never exceeded 60 tons a-week. The produce per furnace now averages 90 tons a-week. Ten tons of this I attribute to the use of raw pit-coal, and the other twenty tons to the use of hot blast." [Papers on Iron and Steel, 127.] The produce per furnace is now 200 tons a-week and upwards. The hot blast process was afterwards applied to the making of iron with the anthracite or stone coal of Wales; for which a patent was taken out by George Crane in 1836. Before the hot blast was introduced, anthracite coal would not act as fuel in the blast-furnace. When put in, it merely had the effect of putting the fire out. With the aid of the hot blast, however, it now proves to be a most valuable fuel in smelting. [6] It is stated in the North British Review for Nov. 1845, that "As in Scotland every furnace--with the exception of one at Carron--now uses the hot blast the saving on our present produce of 400,000 tons of pig-iron is 2,000,000 tons of coals, 200,000 tons of limestone, and #650,000 sterling per annum." But as the Scotch produce is now above a million tons of pig-iron a year, the above figures will have to be multiplied by 2 1/2 to give the present annual savings. [7] Papers read by Mr. Ralph Moore, Mining Engineer, Glasgow, before the Royal Scottish Society of Arts, Edin. 1861, pp. 13, 14. CHAPTER X. MECHANICAL INVENTIONS AND INVENTORS. "L'invention nest-elle pas la poesie de la science? . . . Toutes les grandes decouvertes portent avec elles la trace ineffacable d'une pensee poetique. Il faut etre poete pour creer. Aussi, sommes-nous convaincus que si les puissantes machines, veritable source de la production et de l'industrie de nos jours, doivent recevoir des modifications radicales, ce sera a des hommes d'imagination, et non point a dea hommes purement speciaux, que l'on devra cette transformation."--E. M. BATAILLE, Traite des Machines a Vapeur.