S IN OPTICS. men, the superintendent concluded to do nothing, but let the two unions settle the dispute for themselves ; more convenient in use. With a good sized photo ob- BY GEO. M. HOPKINS. and the bricklayers in the building, forty-eightin num- ber, accordingly dropped their tools and departed.… … The native clay is useless. In fact, the only available stage does not interfere with the operation of the in- strument. mineral for the purpose is bauxite, which is an im- Focusing is done by means of tke milled head pure oxide of aluminum.” uses were to suggest themselves. To many the In the…
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