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Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
The Daily Dispatch: September 9, 1861., [Electronic resource] 2 0 Browse Search
Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 8. (ed. Frank Moore) 1 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
ject, these images will be caused to revolve around each other. By sawing the piece in two in the proper direction and cementing the two surfaces with Canada balsam, one of these images may be entirely got rid of A piece thus treated constitutes Nicol's prism, and forms the means by which a very large proportion of the observations on polarized light are made. A device of this kind is furnished with all the better class of microscopes. Tourmaline and various other minerals also possess this enabled alike to determine the constitution of the fixed stars and to ascertain the chemical components of the minutest particles of organic matter, opening a field of scientific inquiry the boundaries of which cannot as yet be even imagined. Nicol's prism is used as an adjunct to the microscope in examining the properties of polarized light. Its action depends on the doubly-refracting property of the material (Iceland spar) of which it is composed. On viewing a small object, such as a