Scientific American 389 December 5, 1908. W. & L. E. GURLEY TROY, N. Y.f U. S. A. … Physical and Scientific Apparatus for schools, colleges and private laboratories. Electrical Test Instruments. Write for catalogue "P" Accurate Mercurial Thermometers. Write for catalogue "W" Please mention the Scientific American when writing Branch factory, Manufacturers' Exchange Building,…
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