Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 1378
nts. 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 easj^ 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 station,…
