. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE LEAD-CABLE BOEER 11^ CALIFOEN^IA. 5 and insulating the wires, and resheathing, which in a 600-pair cable means considerable skilled labor.* Most of the damage is probably clone from June to August, when the beetles are emerging in large numbers. The injury is not ap- parent, however, until later, after the rains, when the water soaks through and causes a short circuit. Thus usually all the " troubles " come at Fig. 3.âHoles bored in the lead sheathing of aerial cables by the California lead-cable b
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. THE LEAD-CABLE BOEER 11^ CALIFOEN^IA. 5 and insulating the wires, and resheathing, which in a 600-pair cable means considerable skilled labor.* Most of the damage is probably clone from June to August, when the beetles are emerging in large numbers. The injury is not ap- parent, however, until later, after the rains, when the water soaks through and causes a short circuit. Thus usually all the " troubles " come at Fig. 3.âHoles bored in the lead sheathing of aerial cables by the California lead-cable borer (Scohioia declivis) at Tarious localities in California. Natural size. OCCUREEJN-CE AND ExTENT OF INJURY TO CABLES IN THE UNITED ; The first report of the boring of cable sheath by insects was re- ceived from California in the fall of 1903. It is understood that prior to that time about 100 cases of injury had been experienced over the period of five or six years. The borings occurred adjacent to metal cable hangers, and at first it was thought that the use of mar- * In getting the exact location of and repaii'ing " bug " ti'ouble the linemen travel along the cable on a pulley or sliding seat hung on a messenger cable. Of course the wire trouble or leak is approximately located from the office by means of the " T^Tieatstone ; Injury is remedied by " wiping " a knob of lead on a patch or cutting away the lead and putting on a new joint or " ; Dry holes are merely soldered ; that is, where the moisture has not soaked through. (PI. X, Fig. 1.) ^ By R. F. Hosford, Engineer, American Telephone &â Telegraph Co., New York, N. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : Th
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