can be worked during heavy storms and freshets, and the depth of snow is of no consequence; moreover it will run as As this most useful apparatus is not as universally known well by night as by day, and with no more care. as it deserves to be, and as its description is totally omitted “The… … section of the same. It is made of three vessels of sheet should be conducted through a hard glass tube of narrow tin, of similar shape, and fitting concentrically one ‘into the caliber which should be heated at some part by a spirit or other. In the smallest central vessel, M, we place the body…
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