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New Zealand Herald, Volume XXI, Issue 6936, 9 February 1884, Page 4 (Supplement)

What is gas coke ? Gaa coke \a nearly all carbon, and carbon proporly burned will give out, in round numbors, 14,000 units of ho»t por pound, or very nearly as much as tho beat English steam cools. Indeed, coril only surpasses it boc&use of the small qunntity of hydrogen which it contains uncomblnod with oxygen. It is often urged th»t ooko cannot be as good as coal tiecauao it has lost all the heat-producing power equivalent to that of the gas driyon off. It Is quite true that tho coko resulting from one ton of coal does not possess the same calorific valaa as tho coal from which it was made. But It mnst be borno in mind that we aro comparing coke with coal weight for -wkioht. Thuj, lOOlbs. of coal produces eelbs. of oofco; so that some 80cwt. of coal is roquirod to produce ono ton of coke, and the difforonco satisfactorily allows for the heat producing power of tho gas driven off. < Toothaohb Core.—Edeon's Magic Essence gives immediate rollef. In shining bottles.