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Scientific American, Vol. 20, No. 13 (March 1869) (1869)

leaf 4

An illustration from Scientific American, Vol. 20, No. 13 (March 1869), 1869, leaf 4
s held to the surface of the occasioned by the vast number of rats which infest that city, boiler head by a spiral spring under the head of the screw, as and asking if any one can invent a .gtyle of building which 'Wonderful Besults from Expanding Steam. seen in Fig. 1, which is a side elevation or… … there mounts almost perpendicular so as to reach 40 pounds while Fig. 2 is a plan, or top view. This spring forms also a gorgeous and beautiful in appearance. at the end, it is evident the port is well open at the commence safety valve by permitting an over-pressure of steam to lift The Vermont…

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