Issue 19 and Volume 1888 4.

A DOUBLE TANK CHEMICAL ENGINE. The chemical engine illustrated herewith is of the double horizontal tank type, each of the two tanks having a capacity of fifty gallons. These tanks are of copper, weighing six pounds to the square foot, and are tinned inside. At the rear end of each tank above is a brass dome, containing a glass ball for holding the acid, and this acid chamber is revolved by a handle on the outside of the dome, and is closed by a valve at the top. Agitators extend the whole length of the tanks for the purpose of thoroughly dissolving the soda and preventing it from settling. Discharge pipes extend from the bottom of each tank into a brass air vessel at the forward end. This air vessel is connected with an automatic reel with the necessary valve and pipe, and there are on it also discharge valves…

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