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In order to satisfy the requirements which have newly arisen in connection with navigation, locomotion, small motors and apparatus which need for their working an intermittent supply of steam, it became necessary to modify the construction of steam boilers, to augment their heating surface, to diminish their residue of water, and to gradually construct so-called inexplosible apparatus, of which the Belleville boiler forms one of the most characteristic prototypes.
Serpollet Brothers have succeeded in constructing a type of boilers which may be called absolutely inexplosible, and this result has been obtained by reducing the capacity of the boiler to practically nil, thus rendering the explosibility also nil, for under the circumstances the relation between capacity and vaporizing power becomes itself nil. The method employed for this purpose by Messrs.
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