Nature . i:u - raved Real AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Allen in Knowledge. The Platyscopic Lens is invaluable to botanists, mineralogists, or ento-mologists, as it focuses about three times as far from the object as theCoddington Lenses. This allows opaque objects to be examined easily. The Platyscopic Lens is made of four degrees of power, magnifyingrespectively lo, 15, 20, and 30 diams. ; the lowest power, having t
Nature . i:u - raved Real AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Allen in Knowledge. The Platyscopic Lens is invaluable to botanists, mineralogists, or ento-mologists, as it focuses about three times as far from the object as theCoddington Lenses. This allows opaque objects to be examined easily. The Platyscopic Lens is made of four degrees of power, magnifyingrespectively lo, 15, 20, and 30 diams. ; the lowest power, having the largestfield, is the best adapted for general use. The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. Price of the Platyscopic Lens, vtonnied in Tortoiseshell, magnifying either 10, 15, 20, or yt diameters, each power, 15s. In nickelised German Silver, each poiver^ 17s. 6d. Illustrated Description sent free. JOHN BROWNING, 63 STRAND. LOITDOIf. SPECTACLESELECTRIC LIGHT, INC
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
