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 200
of them in the vicinity of the arc, are completely en-closed in a glass globe. Figure 133 shows the ordi- 198 Operating and Testing nary method of enclosing the arc and, while there aremany variations in detail both of the enclosing globeand the cap at the top, the principle of all of them isthe… … Figure 133 carbon descends. This cap is generally arranged toallow of some play sideways so that the carbon willnot bind, should it be of slightly irregular shape, andthe joints between the cap and the globe are groundsmooth so as to exclude the air as much as possible. When an arc is started in an…
Electrical engineering · Electric testing
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