Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 294
ted annually because owners and opera-tors do Dot understand the loss of energy caused bycontinuing lamps of low efficiency in service. There are two very simple methods of measuringcandlepower; one of these is known as Rumfords, andis illustrated in Figure 170. A suitable pencil is setup about 2… … Figure 170 then set up in such a manner as also to cause Hie pen-cil to cast a shadow upon the same screen but al ;idifferent angle From the other. 11 will be noted thateach lamp illuminates Hie shadow made by the other and that when the intensity oF the two Lights at thescreen is equal, the…
Electrical engineering · Electric testing
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