Abstract

With reference to the leading characteristics of compressed air as a motor, I will proceed to consider its possible application to subterranean railways, and in doing so will assume as a basis. for discussion, that we have a double track railway ten miles in length, with moderate curvature and reasonable grades, and an air pipe along the centre, of ten or twelve inches in diameter, with compressing machinery at either end driven by steam, of sufficient capacity to maintain a pressure in the pipes of any given standard.

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