Twentieth century handbook for steam engineers and electricians, with questions and answers; a practical nontechnical treatise on the care and management of steam engines, boilers and electric machinery (1922)
Swingle, Calvin Franklin, 1846- [from old catalog] · 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 intothje earth at several points about the…
