Publisher's Synopsis
Excerpt from Teachers' Notes for Lessons, With Blackboard Illustrations: I. The Manufacture, Distribution and Use of Gas; II. The Practical Applications of Gas; III. General Knowledge; IV. Domestic Economy; To Which Four Appendices Are Added
Note that the composition of the gas obtained from coal varies very widely according to the conditions of the reaction. Thus coal may spontaneously give off methane but this is less than a quarter of ordinary commercial gas, while the gases which burn in an ordinary coal fire may contain quite different pro portions of the characteristic substances, and even, to a less extent, different constituents. (see next page).
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