A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .. (1859)
Feuchtwanger, Lewis. [from old catalog] · New York, D. Appleton & company · leaf 97
of reflectionshall have any desirable inclination to exhibit the simplepolarization of light. This instrument furnishes a simple test whether mineralsthat, cleave readily into thin lamellae are optically mono-axial or binaxial. Place the two mirrors with their polari-zation-planes at right angles,… … i PHYSICAL PROPERTIES OF MINERALS. 91 naxial system, the light from the first mirror a, in passingthrough it, is doubly refracted and has its polarizationchanged, and consequently can be again reflected from thesecond mirror ?n, and in each revolution of c will show fourmaxima and four minima…
Precious stones · Building stones · Mineralogy
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