On the Connexion of the Physical SciencesJ. Murray, 1858 - 523 pages |
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Page 182
... tourmaline like other doubly refracting bodies , each of the transmitted rays would be double ; but that mineral , when of a certain thickness , after separating the light into two polarized pencils , absorbs that which undergoes ...
... tourmaline like other doubly refracting bodies , each of the transmitted rays would be double ; but that mineral , when of a certain thickness , after separating the light into two polarized pencils , absorbs that which undergoes ...
Page 183
... tourmaline , emerald , beryl , & c . , the crystals are negative , which is the most numerous class . The ordinary ray moves with uniform velocity within a doubly refracting sub- stance , but the velocity of the extraordinary ray varies ...
... tourmaline , emerald , beryl , & c . , the crystals are negative , which is the most numerous class . The ordinary ray moves with uniform velocity within a doubly refracting sub- stance , but the velocity of the extraordinary ray varies ...
Page 184
... tourmaline is turned round in its own plane , the dark cloud will diminish , and entirely vanish when the axis of the tourma- line is horizontal , and then every part of the surface of the glass will be equally illuminated . As the ...
... tourmaline is turned round in its own plane , the dark cloud will diminish , and entirely vanish when the axis of the tourma- line is horizontal , and then every part of the surface of the glass will be equally illuminated . As the ...
Page 186
... tourmaline , with its longitudinal section vertical , an obscure cloud , with its centre totally dark , will be seen on the glass . Now , let a plate of mica , uniformly about the thirtieth of an inch in thickness , be interposed ...
... tourmaline , with its longitudinal section vertical , an obscure cloud , with its centre totally dark , will be seen on the glass . Now , let a plate of mica , uniformly about the thirtieth of an inch in thickness , be interposed ...
Page 187
... tourmaline revolves , the red will vanish by degrees till the film is colourless ; then it will assume a green hue , which will increase and arrive at its maxi- mum when the tourmaline has turned through ninety degrees ; after that ...
... tourmaline revolves , the red will vanish by degrees till the film is colourless ; then it will assume a green hue , which will increase and arrive at its maxi- mum when the tourmaline has turned through ninety degrees ; after that ...
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61 Cygni absorbed action appears atmosphere attraction bismuth blue bodies centre centrifugal force chemical circular polarization coloured rings comet consequently copper crystal dark density diamagnetic diameter diminishes direction distance disturbing earth ecliptic effect electricity equal equator ethereal medium excentricity experiments extreme force gravitation greater heat hemisphere increase intensity Jupiter latitude length lines liquid longitude luminous lunar magnetic mass mean meridian metallic miles molecules moon motion move nebula nodal lines nodes NOTE nutation observed optic axis orbit parallax paramagnetic particles passing perihelion period perpendicular phenomena plane polarized light pole position prism produced quantity rays reflected refraction refrangible retrograde motion revolution revolving right angles rotation round satellites Sir John Herschel solar spectrum sound space stars substances sun's surface telescope temperature terrestrial theory tion tourmaline transmitted tricity undulations Uranus vapour velocity vibrations violet visible Voltaic waves wire