Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 159
of the light; inthe latter, it detracts much less fromthe brightness of the image, but cutsoff a good deal of the margin of thefield. A plate of Tourmaline or Hera-pathite, u obtainable of sufiicient sizeand freedom from colour, has a de-cided advantage above the Nicolprism, as an analyzer, in… … POLARIZING APPAEATUS :—SELEXITE STAGE. 137 by tlie use of Polarized Light (Chap, xx.), it is desiiableto interpose a plate of Selemte beneath the polarizer andthe object; and it is advantageous that this should bemade to revolve. A very convenient mode of elfectingthis, is to mount the selenite…
Microscopy
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