Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 451
of Iceland spar, which he can very easily cleave into rhom-bohedra, and with these, which need not exceed half an inch square, or costmore than a few pence, he can demonstrate for himself the phenomena, andbecome familiar with their laws. He will find very convenient the simpleplan recommended by… … 402 LIGHT. of the box, turning the lid, and the crystal with it, to observe the rotationof the image. The same arrangement will serve, by merely attachinganother rhomb of spar within the box, to study the very interesting factsof the polarization to which we are about to claim the readers…
Inventions
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