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BELL SYSTEM TECHNICAL JOURNAL 



Fig. 49 — Trenching maciiine. Digs trench 1.7 meters deep and 55 centimeters 

 wide, at speeds varying between 0.2 and 1.2 meters per minute, and is carried from 

 job to job upon a trailer drawn by 23^ ton truck. 



i-^^Stf^^. 



Fig. 50 — ^Automobile truck equipped with tracks for hauHng cable on private right 

 of way. With tracks, speed about 16 kilometers per hour. Can carrv 4500 

 kilogram reel up 40% grade. Tracks can be removed using special equipment 

 provided for that purpose; without tracks speed 27 kilometers per hour. 



