. The London, Edinburgh and Dublin philosophical magazine and journal of science . traces of mercury.—Kaiserl. Alcad. d. Wien. Classe. 1879, INo. X. p. 109. THELONDON, EDINBURGH, and DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [FIFTH SERIES.] AUGUST 1879. XL Electro-optic Observations on various Liquids. By JohnKerr, , Free Church Training College, Glasgow*. IN two short papers winch were published some years ago,I showed how I had succeeded in inducing a power ofdouble refraction in glass, carbon disulphide, and several otherdielectrics, by the applic
. The London, Edinburgh and Dublin philosophical magazine and journal of science . traces of mercury.—Kaiserl. Alcad. d. Wien. Classe. 1879, INo. X. p. 109. THELONDON, EDINBURGH, and DUBLIN PHILOSOPHICAL MAGAZINE AND JOURNAL OF SCIENCE. [FIFTH SERIES.] AUGUST 1879. XL Electro-optic Observations on various Liquids. By JohnKerr, , Free Church Training College, Glasgow*. IN two short papers winch were published some years ago,I showed how I had succeeded in inducing a power ofdouble refraction in glass, carbon disulphide, and several otherdielectrics, by the application of electric forcef. In this paperI propose to offer some notes of a later and more extendedseries of experiments on the same subject. The methodsapplied are, for the most part, much the same in principle nowas formerly; but my means of observation have been greatlyamplified and improved, chiefly by assistance from the Govern-ment Fund. I begin with the construction of the most im-portant part of the apparatus. 1. New Plate Cell.—This piece is represented in the adja-. cent diagram. It is made of a block of carefully selected * Communicated by the Author. t On a new Relation between Electricity and Light/ PhilosophicalMagazine, November and December 1875. Phil. Mag. S. 5. Vol. 8. No. 47. August 1879. H 8l> Dr. J. Kerrs Electro-optic plate glass, f of an inch thick, 8 inches long, and originally,for convenience in boring, about 4 inches wide. The firststep in the construction is made with steel drill and turning-lathe. Two fine holes, about y1^ of an inch wide, are drilledright through the block, one parallel to its length, and theother crossing the former at right angles in the centre of thepiece. Each of the borings is parallel to, and equidistantfrom, the two plate-faces. The plate is now reduced to a more convenient width, oneinch of it (as it stands in the diagram) being ground away atthe top from end to end, and similarly one inch at the bottom,except that a pi
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