A rational design of a furnace needs some operations of calculation. But a tsoublesome computation may often be a cause of giving up the ratìonal design and of adopting a simple judgement which tends to go amiss without full experiences.
Rough calculation generally will do for a furnace design, because so many variable conditions in working a furnace would depart from the accuracy of calculations made for the designing.
Nomographs, or computation charts, are quite suitable for a furnace design. We ean roughly compute by the aid of them very easily, in a short time, and Without any mistake in the place.
The author has constructed many nomograpbs applicable for a furnace design, among which he introduces several charts.
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