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<br />1_,- ..., <br />'-f..... , <br /> <br />CONSTRUCTION UTILITIES <br /> <br />. 139 <br /> <br />and three from that point to the Colorado River. The completion <br />of this contract in November 1933 marked virtual completion of <br />the trunk and tap lines of the District's constrnction telephone <br />system. Later additions consisted of the extension of two circuits <br />westerly from Valverde to Cajalco dam in July 1935, and tap lines <br />to aqueduct camps as new const>'uction was begun. <br /> <br />In July 1938 a switchboard was installed at Berdoo camp, Di- <br />vision 4 headquarters, with direct trunks between it and Banning. <br />The same type of installation was completed in September 1933 to <br />Division 3 headquarters; in January 1934 to Division 1; and in <br />January 1936 to Division 2. The switchboard at Division 3 handled <br />all traffic east of that point unt.il April 4, 1935, when an operator <br />became necessary at Division L The operation of the switchboard <br />at Division 2 was begnn January 22, 1936, Thereafter service was <br />available throughout the system from 8 to 24 hours daily, depend- <br />ing upon the traffic. <br /> <br />On September 13, 1935 a contract was awarded for construction <br />of telephone lines between Boulder dam and the aqueduct pumping <br />plants. Upon completion of these lines in May 1936 connections <br />were made to the existing District system, extending its service <br />area to every working point on the project. The construction and <br />costs of this line are detailed in connection with the Boulder trans- <br />mission line. <br /> <br />The following tabulation shows, as of June 30 of each year, the <br />telephone facilities installed and operating as part of the construc- <br />tion communication system: <br /> <br />hem 1934 1935 1936 1937 1938 <br />S~jlchboard!,; <br />in operatioll_ "nmm_'..n 3 3 5 5 3 <br />Number of inslrull1eJlts- <br />M. w. D...______ IR.1 226 2.37 209 173 <br />Number of inslrUffieJ1t-;- <br />contractors ........-.....--.. 27 48 57 16 II <br />TOI:l1 miles of metallic <br />circuits in uperation... 1.055 1.060 1,273 1.265 1,206 <br />Miles of 1\1. W. D. pole line <br />ill operation -- 26::..5 310.4 450.7 4S~t2 441 <br />Miles of pol~ line utilizer! <br />joilltl~ with ()ther~ _. 87.8 8/.R 87.8 87.f:! 81 <br />