A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures (1848)
Quekett, John, 1815-1861 · London, H. Bailliere · leaf 268
r the diagram moreintelligible, it may be as well here to state that ordinary lightis represented by a cross, which denotes that its vibrations arein planes, at right angles to each other, whereas, when one setof such vibrations only is shown, the light is said to be polar-ized. Mr. Woodwards… … Fig. 141. of common light; E a plate of tourmaline placed with itscrystallographical axis in a vertical direction; this is called thepolarizer; a F beam of polarized light obtained from A B C D15* 228 USE OF THE MICROSCOPE. by the stoppage of plane CD; G a film of selenite of such athickness as to…
Microscopy
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