. Electrical instruments and telephones of the Signal corps . Iest coniKctor. Where crossing undci- a heaxy lead, and hiMvy guard wires are used,guy wires .should be run from the top of poles 1 and 4 to a i)oint 8or more feet from the butt of the next pole to hold the strain of the guard wires. ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 203 NUMBERING POLES. Distinctly mark with paint each twenty-fifth (or mile) pole Avithits proper number, from the initial to the terminal point of thesection, to facilitate rendering- reports and to enable repair men toreport locations of repairs made and
. Electrical instruments and telephones of the Signal corps . Iest coniKctor. Where crossing undci- a heaxy lead, and hiMvy guard wires are used,guy wires .should be run from the top of poles 1 and 4 to a i)oint 8or more feet from the butt of the next pole to hold the strain of the guard wires. ELECTRICAL INSTRUMENTS U. S. SIGNAL CORPS. 203 NUMBERING POLES. Distinctly mark with paint each twenty-fifth (or mile) pole Avithits proper number, from the initial to the terminal point of thesection, to facilitate rendering- reports and to enable repair men toreport locations of repairs made and needed. CLEARING AND TKIMMINli. Over right of way covered with trees or undergrowth, axmen mustprecede all others, except the surveyor, and clear the way for thework. When the line has been erected, tliey must follow and removeall branches or twigs which are liable to be thrown into contact withthe wire, clearing back for a space of 4 or C feet, and removing all. Guard wire. dead branches, no matter what their distance, that might be throwndown by high winds and strike the line. AVhen the line passes through regions where it is lial)le to be in-jured by prairie fires, the sod should be broken and grass turnedunder to a distance of 10 feet from each pole. Officers in charge oftelegraph lines running through such sections shoidd send a partyalong the line each year to break the sod around the poles. RIVER CROSSINGS. When navigable streams cross the route of the line, it is usually thebetter plan to use cables, except where they are liable to be washedout by freshets; but if this method be for any reason supports must be used and the wire suspended above danger 204 ELECTRICAL INSTRUMENTS JJ. S. SIGNAL CORPS. from passing vessels. Natural supports, such as trees -well rootedin safe positions, if such can be found of sufficient height, may beused, or masts erected and securely stayed with ^Yire or wire-ropeguys. If the span b
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