Nature . R. Sl J. BSCK, Ltd. 68 CORNHILL, LONDON, AN ACHROMATIC COMBINATION,COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If yon carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Allen in Krurojledge. Tht Platyscopic Lens is in\-aluable to botanists, mineralogists, or ento-mologists, as it focuses about three limes 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, zo, and 30 diams.; th
Nature . R. Sl J. BSCK, Ltd. 68 CORNHILL, LONDON, AN ACHROMATIC COMBINATION,COMBINING THE DEFINITION OF A MICROSCOPE WITH THEPORTABILITY OF A POCKET LENS. If yon carry a small Platyscopic Pocket Lens (which every observer ofNature ought to do).—Grant Allen in Krurojledge. Tht Platyscopic Lens is in\-aluable to botanists, mineralogists, or ento-mologists, as it focuses about three limes 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, zo, and 30 diams.; the lowest power, haWng the largestfield; is the best adapted for general use. The Lenses are-set in Ebonite Cells, and mounted in Tortoisesbell Frames. Price o/tlu Platyscopic Lens, mounted in Tortoiseskell, magnifying either lo, 15, 20, or 30 diameters, each power, I5s, - In nicketised German Silver, each pmver. 17s. 6d. Illustrated Description sent free. JOHN BROWNING, 63 , W,C. THE TOURISTS ANERM (WHITESIDE-COOKS.)
Size: 2321px × 1077px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectnaturalhistory, booksubjectscience
