d at publication office as early as Thursday morn- and in most cases they have to be disconnected from the pipes, often costing more than a new valve. The Jenkins ing to appear in next issue. Discs used in these valves are manufactured under our 1880 patent, and will stand any pressure of steam,… … A paper by A. W. Wright, CM., discussing the compar- FOR 1888. ative value of iron and steel as materials forstreet rail- THE IRON AND COAL DISTRICTS road rails. Contained in Scientific American Spp- The Blost Popular Scientific Paper in the World. of Alabama.—An interesting paper, with map shewing…
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