The Philosophical magazine; a journal of theoretical, experimental and applied physics . the Nicols are parallel, or nearly so, the bands are white upona deep reddish-purple ground, as shown in lig. 1 ; with theNicols crossed, the bands are dark upon a light greenish-yellowbackground, as represented in fig. 2. Turning one of theNicols 45° in one direction, the observer sees the central banda intensely blue upon a yellow ground; turning in the otherdirection, a bright yellow upon a dark blue; and intermediatepositions give the usual varying tints. Examined with one Nicoland unpolarized light th
The Philosophical magazine; a journal of theoretical, experimental and applied physics . the Nicols are parallel, or nearly so, the bands are white upona deep reddish-purple ground, as shown in lig. 1 ; with theNicols crossed, the bands are dark upon a light greenish-yellowbackground, as represented in fig. 2. Turning one of theNicols 45° in one direction, the observer sees the central banda intensely blue upon a yellow ground; turning in the otherdirection, a bright yellow upon a dark blue; and intermediatepositions give the usual varying tints. Examined with one Nicoland unpolarized light the plate is perfectly colourless, and showsno trace of its heterogeneous structure. The quartz plate was placed in one end of a tube, large enoughto admit its full size very nearly, and 11 inches in was found better than a .shorter one, as the bands are mosteasily seen when not nearer the eye than the limit of distinctvision. In the other end was placed a good-sized Nicol; andthe tube was provided with a joint, so that the latter could beeasily turned. Thus mounted the pl
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