1|C>3^ ■■ ■■■1 T^C#5L>^T "V •^O"3 [Entered at the Post Office of New York, N. Y., as Second Class Mattel-. Copyrighted, 1»8", l>y -Muim & Co.] A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES, [$3.00 per Year. NEW YORK, NOVEMBER 5, 1887. Vol. LVII -No.… … EXTERIOR OF MR. EDWARD WESTON'S RESEARCH LABORATORY, NEWARK, N. J. electrical testing and experimental apparatus, and a determine their illuminating power. In testing them they are photometered in various positions, in order to obtain an average result or " the spherical illuminating po\»er.'' In…
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