I shall now show, by means of diagrams, some of the several kinds of safety- valves I have had in use. ... The first is the hand-screen ; and consists of a thin panel of white wood, cut to an elegant design, by means of what is technically ... Professor Staas, in the Chemical News, points out that the carbonates of potash and soda fuse at a lower temperature when ... civic. guards. at. Liege, . following. the. example. of. their Antwerp brethren, are about to present Miss Burdett Coutts with theiranbsp;...
|Title||:||The Illustrated photographer|