. Electrical news and engineering. line was thatonly suspension insulators could be considered, on accountof the liability of the pin type to damage due to mischief orother causes. Having adoipted suspension units, there was noobject in setting a lower voltage than the one chosen. It is,however, more liljely that this undertaking was intended as 30 THE ELECTRICAL NEWS hine 1. IJIS an experiment, and that the voltage was chosen with a viewto systems of much larger extent, such as are now frequency is 50 cycles, and about 10,000 is car-ried over each circuit. Wires are of cop
. Electrical news and engineering. line was thatonly suspension insulators could be considered, on accountof the liability of the pin type to damage due to mischief orother causes. Having adoipted suspension units, there was noobject in setting a lower voltage than the one chosen. It is,however, more liljely that this undertaking was intended as 30 THE ELECTRICAL NEWS hine 1. IJIS an experiment, and that the voltage was chosen with a viewto systems of much larger extent, such as are now frequency is 50 cycles, and about 10,000 is car-ried over each circuit. Wires are of copper, seven strand,50,000 cm. in area, strung on narrow base steel double-cir-cuit towers. The standard span is 500 feet, with a long cross-ing to negotiate the River Elbe of 900 feet. Instead of theusual German practice of using bronze wires for this longspan, it was decided to employ copper of 85,000 cm., strungwith a safety factor of five. The spacing between conductorsis very short, being only six feet. With this short Fig. 24. One of the anchor towers on the lines of the Pacific Lightand Power Corporation. the small wires and the high voltage, it is not surprising tliatconsiderable corona losses have been experienced, a factorwhich was evidently quite overlooked when the lines weredesigned. As with most European lines, grounding arms areprovided on every tower, so that the conductor cannot fail tomake contact with one of them if it breaks. Furthermore,conductors are arranged on the equilateral plan, and aretransposed times in the total 35 miles. Lake Coleridge Development The Ontario Government is not the only one which haspersonally supervised and conducted great water-power andtransmission developments; similar achievements have beenmade in New Zealand. The first of the government powerundertakings to be put into operation is known as the LakeColeridge Development. The lake is situated in the SouthernAlps of South Island, about 70 miles from
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