. Electrical news and engineering . the continued influence of a high electromotive force, showlishing, and other enterprises. ^ ^^^ alteration in conductivity. These liquids also exhibit the phenomenon of electrical convection, a current of the electro- lyte setting in from the one electrode, whilst the other appears simply to attract the repelled liquid. Recently, Emil Warburghas been investigating these phenomena. He employed mixturesof liquids which possessed low conductivity, gradually reducingthe proportion of one of the constituents until the conductivity wasnearly that of the other. Su
. Electrical news and engineering . the continued influence of a high electromotive force, showlishing, and other enterprises. ^ ^^^ alteration in conductivity. These liquids also exhibit the phenomenon of electrical convection, a current of the electro- lyte setting in from the one electrode, whilst the other appears simply to attract the repelled liquid. Recently, Emil Warburghas been investigating these phenomena. He employed mixturesof liquids which possessed low conductivity, gradually reducingthe proportion of one of the constituents until the conductivity wasnearly that of the other. Such mixed solutions as these werefound still to exhibit the above phenomena. The behaviour ofthese solutions, in fact, was such that Warburg is led to the con-clusion (vide Ann. Pliys. Chem., 1895 [2], liv., pp. _^q6—433), thatthey contain an electrolyte in a slate of great dilution, upon whichtheir conductivity depends. He suggests that the extraordinarybehaviour of the so-called pure (liquids is capable of a PRESERVING TELEGRAPH POLES. Ix the preparation of posts for the telegraph servicein Sweden, the following simple, effective and cheapmethod of preserving wood from decay is said to beemployed : A square tank, having a capacity of some200 gallons, is supported at a height of 20 feet or 25feet above the ground by means of a light skeletontower built of wood. A pipe drops from the bottom ofthe tank to within 30 inches of the ground, where it isconnected with a cluster of flexible branches, each end-ing with a cap having anorifice in the centre. Eachcap is clamped on to thelarger end ot a pole insuch a manner that noliquid can escape from thepipe except by passing intothe wood. The poles arearranged parallel with oneanother, sloping down-ward, and troughs rununder both ends to catchdrippings. When all isready, a solution of sul-phate of copper, which hasbeen prepared in the tank,is allowed to descend thepipe. The pressure pro-duced by the fall is suffi-c
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