tower and, resting quietly on the bottom, permit pacific the metal at the back, forming a brighter image stands; this revolves independently of the main vessels to enter as they please. The object of these than the first ; and this second image may be seen at tower by means of the gearing, D. The… … important.in the revolving fort. Herearesixty guns, The accompanying diagram illustrates the subject. (1861 and 1862), and which showed no signs of fad- we will assume, that are to be brought into service. a, is the front surface of the mirror, and 4, the metal ing or alteration whatever. This,…
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