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 212
witch, and an automatic switch that will shunt the current around the carbons,should they fail to feed properly. The hand switch to be approved, ifplaced anywhere except on the lampitself, must comply with requirementsfor switches on hangerboards as laiddown in No. 56. 58. Spark Arresters. (See… … Fig. 132. 59. Insulating Joints. (See No. 26 a.) a. Must be entirely made of material that will resist theaction of illuminating gases, and will not give way or softenunder the heat of an ordinary gas flame or leak under a mod-erate pressure. Must be so arranged that a deposit of moisturewill not…
Electrical engineering
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