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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt:...and the fire is allowed to burn too rapidly. A large area of bars does not allow of the passage of a large volume of air, unless the damper is opened sufficiently to admit of this; therefore, if an error is to be made, it is best to make it on the side of too great an area rather than too small. It is necessary to speak in this manner as no precise rule exists or can be made to give the exact area of bars needed by all makes and sizes of boilers. Makers of independent boilers--boilers which have the bars sent as part of their structure--may be relied on to send what is best, but it is doubtful whether anyone could say the bars sent were of a precisely correct area. What is doubtless done is to estimate the correct area by tables or experience, or both, and then add a little to it to be on the safe side. Area of fire bars includes the bars and the spaces between the bars. It is only with brick-set boilers that the heating engineer may have to choose the area of fire-bars he will use, as all independent boilers are provided with these and sent out complete, by the maker. The table which follows is therefore very brief, as it can refer only to the saddle boiler and boilers of somewhat similar character; and, it may be added, every boiler maker is prepared to send, with boilers of these kinds, a set of bars and furnace fittings, of suitable size, if he is asked to do so. The area of furnace bars is therefore, at this date, more a subject for boiler makers than boiler users. Area Of Furnace Bars Required By Boilers For Each 100 Feet Of Radiating Surface. Square inches. With a plain saddle boiler... 50 With a saddle boiler having one check or water-way end..... 46 With a saddle boiler having two water-way ends and a tubular flue... 40 With a saddle boiler having...