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[[start page]] 42 Wednesday 10th May 1843 [[underlined]]Phosphoroscence emination[[/underlined]] Contrasted the effect of the light in the last experiment with that of the electrical spark in the production of phosphorescence. The same glasses resting on the wood block were placed over a shallow box containg the sulphurette of lime and the spark from a single phial passed over them. The only plates under which the lime became phosphorescent, was the thin clear glass and the violet, but under the latter it was much less intense than under the former. All coloured glasses appear to lessen the transmissability of the phosphoresence principle. The refrangibility of the phosphorosence emination was very prettily exhibited by placing the larger lead box containing the sulphurette of lime under a plate with a slit in it, and then passing the discharge over the slit at the distance of about an inch, the [[strikeout]] lime being at about the same distance below the slit. The image of the slit was depicted on the surface of lime in a well defined [[strikeout]] broad [[/strikeout]] narrow line. The same experiment was repeated with the difference of placing a prism of salt over the slit, the impression was now increased 5 or 6 times in width and the whole impression thrown to the other end of the box by the[[underlined]] refraction power [[underlined]] of the salt prism. I next made some experiments on the refractive[[?]] transmissability of this emination through different liquid substances. The liquid was placed in a cube made of the cylindrical part of a 4 ounce phial to which a bottom of a plate of rock crystal was cemented. [[end page]] [[start page]] Wednesday 10th May 1843 order of phosphorescence transmissibility of [[underlined]] liquids [[underlined]] 43 The first series was with [[underlined]] water bichromate [/underlined]] of [[underlined]] potassa [[/underlined]] and [[underlined]chlorate [[?]] of lead [[/underlined]]. The water is not perfectly [[transoophorescent?]]. The bichromate is less so , and the perfectly transparent [chlorate? of lead is almost as impervious as glass or mica. 1st series [[underlined]] the order is as follows [[/underlined]] 1 transparent water 2 boron solution bicarb pottass dark 3 transparent chromate of lead - dark found this a solution of [[circled]][[acetic?]][[/circled]] acid [[underlined]] 2nd series [[/underlined]] 1 water dark 2 nitric acid dark 3 chlorate of lead all transparent [[} grouping items 1 through 3]] [[underlined]] 3rd series [[/underlined]] water solution of alum sulphate of magnesia minerals of ammonia x camphor water [[Grouped]]all transparent all transmit like water[[/grouped]] (see [[strikeout]] page 44) [[underlined]] 4th series [[/underlined]] sulphate of copper nitrate of copper [[grouped]]coloured blue transmit much more feebly than water[[/grouped]] 5th series sulphate of zinc transparent but transmits badly The bad transmitters according to these experiments are as follows: [[underlined]] nitric acid[[underlined]] [[strikeout]] [[difulconate?]] of lead [[/strikeout]] sul acid, n. 47 [[underlined]] sulphate of zinc[[underlined]], [[underlined]] acetate of lead[[underlined]], (page 44) [[?]] n. 47, [[underlined]] acetate of zinc [[underlined]] (p 46), [[underlined]] sulphate of lead [[underlined]] (p. 46), alcohol p 47, [[end page]]
