Nature . R. & J. SECK, Ltd. 68 CORNHILL, LONDON, BROWNINGS PLATYSCOPIC LENS. With Larger Angles, Inci eased Field, and Improved Definition. of Em^rnveil Real ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Pocket Lens (which every ob:Nature ought to do).—Grant Allen in Kfiowledge. The Platyscopic Lens is invaluable to botanists, mineralogists, or ento-mologists, as it focuses about tliree times as far from the object as theCoddington Lenses. This allows opaque objects to be examined easily. The
Nature . R. & J. SECK, Ltd. 68 CORNHILL, LONDON, BROWNINGS PLATYSCOPIC LENS. With Larger Angles, Inci eased Field, and Improved Definition. of Em^rnveil Real ACHROMATIC COMBINATION, COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If you carry a small Platyscopic Pocket Lens (which every ob:Nature ought to do).—Grant Allen in Kfiowledge. The Platyscopic Lens is invaluable to botanists, mineralogists, or ento-mologists, as it focuses about tliree 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 10, 15, 20, and 30 diams. ; the lowest power, having the largestfield, is the best atlapted for general use. ^he Lenses are set in Ebonite Cells, and mounted in Tortoiseshell Frames. iPrice of the Platyscopic Lens, iirounted hi Tortoiseshell, iitagnifying either 10, 15, 20. or -^o diameters, each p07ver, 15s. In nickelised German Silver, each /• 17s. 6d. Description sent free. JOHN BROWNING. 63 STRAND. LONDON, SPf,::CTACLESELECTRIG LIG
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Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
