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Cement for Gas Retorts

A new cement, especially adapted to the retorts of gas-works, is very warmly recommended in a German gas-light journal. It consists of finely-powdered barytes and a soluble water-glass; or the barytes and a solution of borax. The joints are to be coated several times with this cement, by means of a brush. The addition of two-thirds of a part of clay improves the cement, and the retorts will then stand a red heat very well. Instead of the water-glass, a solution of borax may be used, or even finely powdered white glass. 2235. Use of Silicate of Potassa in Strengthening Fossil Skeletons. A very judicious application of the silicate of potassa (liquid glass) has been lately made at the Museum of Natural History of Paris, in repairing a great many fossil skeletons which had been disjointed and broken by the shells bursting in this Palace of Science. The solutions have been first used diluted to about 30° Baumé, and afterwards of a higher degree of concentration. The adherence of the broken or separated pieces is brought together by aptures; also to the varnishing of magic lantern slides, and the protection of any transparent surfaces from the air.