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Admiral David D. Porter, The Naval History of the Civil War. 2 0 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 2 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
is the plan so much and so justly insisted on by Mr. C. W. Williams, Mr. Prideaux, and several others. The air admitted should be heated; and this is best of all done by the use of Mr. C. Siemens' regenerator, applied to the flues of the boiler between the latter and the chimney-stack. If the air be cold, the combustible gases are chilled more or less, and below a red heat these cannot burn perfectly or without the production of smoke. The area of air aperture at the bridge is fixed by Mr. Williams at 1 square foot for every 36 square feet of grate, when the latter burns 25 pounds of coal per foot per hour, and in like proportion for larger consumption. The maximum of economy will, in perhaps all boilers, be effected by the regenerative principle; and in this case the air passed into the flues above the fuel or at the bridge may be admitted at even 800° or 900° Fah. When the proportioning and arrangements of the furnacegrate and draft are such as to insure the conditions for com