by oscillating upon a 6th. For floating batteries the propeller is totally vertical axis, being completely submerged in a recess submerged, and all the machinery may be placed un- Valuable Substitute for Metal. formed to receive it at the stern of the boat, H, as der the water line. The London… … has given the greatest sat- of its axis, and thus drives isfaction to those who have Fig. 2 the vessel along. employed them. The mode In order to draw the ves- of manufacture consists in sel backward the propeller reducing the silicate of must have its plane side magnesia to an impalpable turned…
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