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 115
ufficiently stiff; but where thespan is longer than this or there is considerable vibration,still heavier stock should be used. For general suggestions as to protecting wires on sidewalls, see notes under No. 24 e. Figure 59 is an illustration of protection on side walls, giving the dimensions…
Electrical engineering
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