Town Gas And Its Uses for the Production of Light, Heat, And Motive Power;
Town Gas And Its Uses for the Production of Light, Heat, And Motive Power;
William Hosgood Young Webber
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Driven back upon their own resources by the coldness of all expert Opinion, von Welsbach and his associates had to attack the problem of the supply of the raw material necessary to their manufacture ; and were rewarded by the discovery that the scarcity of these minerals was not positive, but merely temporary, and that they exist in various localities in adequate quantity. They also worked out the method of applying the illuminant elements to the best advantage, so that the formula they arrived... at for the dipping solution (thoria, 99 per cent. ; ceria, 1 per cent.) has held good ever since. Another grave objection to the system was, and still is, the fragility of the illuminant body, which came to be called the "mantle." This weakness the original exploiters of the invention only partially cured by adopting a treatment of the mantles by varnishing, which enables them to be handled and transmitted in packing-cases (Fig. 28). During the several years after the success of the system became assured, and its universal adoption by gas con- sumers was perceived to be only a question of price and 104 TOWN GAS AND ITS USES.
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