of blue vitriol to consume. EQUIPMENTS When set up properly, it will not foul or give out in from three to twelve months, according to the amount of work required from it, and always gives uniform strength of current. ~.^x^' For open circuits, where all other gravity batteries are acknoirledged… … Comf»InedNo. 1 Sounder and Key, with Battery, riiemlraln, OfHoe VTlre, and an Excellent Book of Pracllral Instruction In tlie Art of Teleerrapliy, uhicn gives all necessary directloutai foF EXCELSIOR setting up lite Battery and complete Apparatus, and Operating theui for x»i*acticin£ or…
Telegraph -- Periodicals
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
