Transactions of the Royal Society of Edinburgh . e produced by bendinga piece of tin backwards and forwards, and is markedly intensified by accele-rating the relief, just as the noise made by blowing off steam is intensifiedby enlarging the outlet. When the relief valve is opened very carefully itwhispers gently but very distinctly, till the pressure is all down. If openedcomparatively briskly, but still with great care, the noise is comparatively loud,but more rapidly used up. I forbear making any reflections until I have beenable to study this phenomenon more closely. Pieces of clear ice whi
Transactions of the Royal Society of Edinburgh . e produced by bendinga piece of tin backwards and forwards, and is markedly intensified by accele-rating the relief, just as the noise made by blowing off steam is intensifiedby enlarging the outlet. When the relief valve is opened very carefully itwhispers gently but very distinctly, till the pressure is all down. If openedcomparatively briskly, but still with great care, the noise is comparatively loud,but more rapidly used up. I forbear making any reflections until I have beenable to study this phenomenon more closely. Pieces of clear ice which had been subjected to high pressure in the receiver were finely laminated in parallel planes. In eachplane there was a central patch surrounded nearthe sides of the block by a ring of annexed figure gives an idea of the arrange-ment. The size of the spherules is greatly exag-gerated. The lamination of ice by pressure in onedirection is well known. I am not aware thatits production by pressure in all directions has been ( 59H ) XX.—On the Variation with Temperature of the Electrical Resistance of Wiresof certain Alloys. By Professor J. G. MacGregor, , and C. , (Read 19th July 1880.) The alloys which we used in the following experiments were in the form ofvery thin hard-drawn wires,—the same as those whose thermo-electric proper-ties we described in a paper published in the Transactions of this Societyin 1877.* They were prepared by Messrs. Johnson and Matthey of HattonGarden, London. In giving their constitution we rely upon the authority ofthe manufacturers, as the quantities we had were too small to admit of ourhaving them analysed. The thin alloy wires were successively soldered to thick copper wires, bymeans of which they were placed in one of the arms of a WheatstonesBridge. The other three arms were composed of resistance coils, made byElliott Brothers, London, and arranged in the dial form. In the bridge itselfThomsons dead
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