Figs. 1 and 2 are, respectively, a perspective view and a in these respects to silver. Itis of specific gravity 7.780 to section, showing the form and application of the improve- 8.534. ? ment. A wire of 1-10in. will support a weight of 2994 1b. It melts The arbor, A, is turned off at the end, to… … within the opening, and also prevented being the sulphate of copper, blue vitriol, from turning round, The saw is arranged Cyprian vitriol, or blue copper, which HEALD'S SELF-CENTERING SAW ARBOR. upon the arbor between the two halves of is largely used for medical purposes and the collar. The bevel…
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