Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 82
nga transparent liquid, and N and S are the poles of apowerful electromagnet which are pierced so that it ispossible to look straight through them and through thetransparent substance. A pair of Nicol prisms, P andAn, are placed in the pierced poles, one of them to actas a polariser and the other… … Fig. 47. the electromagnet is now switched on, the field of viewthrough An will suddenly brighten, so that the rayswhich were completely stopped by An before anymagnetic field was established across A are now able,at any rate partially, to get through the Nicol. If theNicol is rotated a new…
Light
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