Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 23
is is the common street arc lamp, as we most fre- quently see it to-day. The candle-power at the most effective angle is somewhat less than 200. As a matter of fact, in practice it probably va- ries above and below the 200 mark considerably, on account of the travel- ing of the arc around the ends… … smaller one taking 245 Fig.
Engineering
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