Nature . No, 55- R. & *J. BECK, Ltd. 68 CORNHILL, LONDON, BROWNINGS PliATYSCOPIC LENS. With Larger Angles, Increased Field, and Improved Definitiom. AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET you carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Alien in 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 Platys
Nature . No, 55- R. & *J. BECK, Ltd. 68 CORNHILL, LONDON, BROWNINGS PliATYSCOPIC LENS. With Larger Angles, Increased Field, and Improved Definitiom. AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET you carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Alien in 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 jjenerai use. The Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. Price o/the Platyscofic Lens, mounted in Tortoiseshell, magnifying either 10, 15, 20, or ^o diameters, each power, 15s. In nickelised German Silver, each power, 17s. 6d. Illustrated Description sent free. JOHN BROWNING, 63 STRAND. LONDON, SPECTACLESELECTRIC LIGHT, INCANDESCENT GAS. And other Pow
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
