Nature . BROWNINGS PLATYSCOPIC LENS. With Larger Angles, Increased Field, and Improved Definition. AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Poclcet Lens (which every observer ofNature ought to do).—Grant Allen in Kncnvledge. 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, magnifyi
Nature . BROWNINGS PLATYSCOPIC LENS. With Larger Angles, Increased Field, and Improved Definition. AN ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Poclcet Lens (which every observer ofNature ought to do).—Grant Allen in Kncnvledge. 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 Platyscopk Lens, mounted in Tortoiseshell, magnifying either 10 \s 20 or-^o diaiiteters, eacit/lO^ver, 15s. /« nickelised German Silver, each /?oioer, 17s. 6d. Illustrated Description sent free. JOHN BROWNING. 63 STRAND^ LONDON, ^reseivts, NEGRETTI &. ZAMBRAS
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
