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~ 1~08 140 METROPOLITAN WATER DISTRICT Type of construction The trunk lines which are to continue in service after aqueduct construction has been completed have been built according to best modern practice, using full-length-treated southern pine or butt- treated cedar poles and hard-drawn copper wire. Protective de- vices installed on the system have been generally satisfactory and no cases of aconstic shock or damage to property have occurred. The system now in nse consists of two circuits leased from the Southern California Telephone Company between exchanges in the Los Angeles head office and the Banning field headquarters, trunk ,lines on District pOles and on poles of the Western Union Tele- graph Company and the Southern California Telephone Company, necessary switchboards at division headquarters and single-circuit tap lines on both telephone and power poles of the District. The District's system is connected with public toll systems so that com- munication can be established between any station on the District lines and stations on any public line. The Banning switchboard is the wire center from which circuits radiate to all points along the aqueduct. It is also the point of interconnection between the Dis- trict s,rstem, the toll facilities of the Bell system, and the leased wires to the Los Angeles office. Operation and ma.intenancc The District installs and maintains telephones as required for the nse of the contractors and the District construction forces, such use being limited to official business, with personal messages trans- mitted in case of emergency. For each call between stations con- nected with the same exchange the District toll is ten cents, and fifty cents if the call is transmitted through more than one ex- change, the time allowed being three minutes or less with a like charge for each additional three minutes or less. Tolls for service over connecting systems are added to the District charges. The personnel necessary to operate and maintain the system con- sists of a supervisor, electricians, switchboard operators, and part time of five patrol crews who maintain the power and telephone s,'stems jointly. No major troubles have been experienced in oper- ating the system and satisfactory transmission has obtained on intra- and inter-system communications. Ticketing and timing by the operators of all messages transmit- ted over the system for which a charge is made were started in ,~ .. "I I' '~" -\ " I ,