Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise .. (1916)
Swingle, Calvin F. (Calvin Franklin), b. 1846 · Chicago, F.J. Drake & company · leaf 1384
oints. The spark gap terminals are threaded, and attached tothe lid of the box, thus affording a ready method of ad- Lightning Arresters 1349 justment, positive grip on the terminals, and easy accessfor examination. Ground Connections.—In all lightning arrester installa-tions it is of utmost… … Fig. 642direct current lightning arrester- -INTERIOR large metal plate buried in a bed of charcoal, at a depthof six or eight feet in the earth. A more satisfactory method of making a ground is todrive a number of 1-inch iron pipes six or eight feet intothe earth at several points about the…
