Even so useful and important a commodity as coal, the "black diamond" can have its disadvantages, as those of us in Shanghai who are continually discovering black smudges on our faces must admit. Also that coal has a sulphuric content is patent to those who suffer the fumes from some grades of this fuel. There are many ways to remove these annoying by-products and one of the most successful results in coke—a coal in which the volatile portion has been lied by heating, The advantages of coke over ordinary coal are more than aesthetic, although its freedom from smut and disagreeable odour would be enough to establish its claim to consideration: but the sulphur clouds which vitiate the atmosphere when me forms of coal are used not only unpleasant but are distinctly un-he y and cause genuine deterioration of property, the sulphuric acid eating into metal and paint, Coke, moreover, possesses a very positive advantage in that it burns vith a very even temperature and it is not necessary to introduce aeration in order to keep it burning as desired. This quality is particularly useful in manufactories and wherever it is necessary to control the amount of heat, Investigation into the utility 53946 of coke will prove rewarding.
Text read from the printed page and cleaned; old type leaves the occasional error.