Modern electrical construction; a reliable, practical guide for the beginner in electrical construction, showing the latest approved methods of installing work of all kinds according to the safety rules of the National board of fire underwriters (1905)
Horstmann, Henry C[harles], 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & Co. · leaf 211
Figure 131 bustible, non-absorptive insulating substance. All switchesattached to the same must be so constructed that they shallbe automatic in their action, cutting off both poles to the lamp,not stopping between points when started and preventing anarc between points under all circumstances.…
Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
