Report of the Meeting of the British Association for the Advancement of Science Volume 65 by British Association for Meeting
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Author: British Association for Meeting
Page Count: 490 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Type: eBook
ISBN: 9781130516937
File size: 32 Mb
File Name: Report.of.the.Meeting.of.the.British.Association.for.the.Advancement.of.Science.Volume.65.pdf
Download Link: Report of the Meeting of the British Association for the Advancement of Science Volume 65
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...that, on the average, the primary1 circulations through the apertures will point in the direction of the field. Consequently the average direction of the secondary spin will be in planes perpendicular to this, and will rotate the plane of polarisation of any light whose wave front passes them. The rotation is produced only on the light which is transmitted through the vortex. The rotation observed is a resultant effect. In fact it is clear that in the case of refraction the optical media belong to the type in which every portion transmits the light, and not to the type in which refraction is produced by opaque bodies embedded in the ether. The atoms are only opaque if they contain vacuous cores. The question of the grip of the particles on the ether does not enter, but difference of quality--showing itself in refraction and dispersion--is due to difference in average rotational quasi-elasticity produced by the atomic circulations, and possibly absorption is due to precessional and nutational motion set up by the secondary spins. These, however, are perhaps rather vague speculations. Instead of attempting to invent ethers, to deduce their properties from their specifications, and then seeing whether tbey fit in with experience, we may begin half way. We may assume different forms for the function giving the energy of the medium when disturbed, apply general dynamical methods, and distinguish between those which are capable of explaining the phenomena we are investigating and those which are not. Invention is then called upon to devise a medium for which the desired energy-function is appropriate. This was the method applied by MacCullagh to the luminiferous ether. He obtained an algebraical form of the energy function which completely satisfied the condition...
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