Perkins, Henry, 1803-1889, publisher, Haswell, Barrington, and Haswell, printer, McManus-Young Collection (Library of Congress) DLC · Philadelphia : H. Perkins, 134 Chestnut Street · leaf 54
lodged a piece of perforated cork;which, being pressed upon by the action of the screw, closesupon the steel stem of the forceps, and steadies them, and theobjects held in them. The stem of the forceps being removed fromits place in the short tube; the handles and lenses, and the rod,c, and the… … 34 SIGHT AND SOUND. This microscope possesses three different magnifying powers,namely, those of two lenses separately, and the two in combination. Microscopes of a still simpler nature are small globules of glass,formed by smelting the ends of fine threads of glass in the flameof a candle ; and…
Scientific recreations
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