Cache American | 1935-08-30 | Page 7 | Largest Switches are Built for Boulder Dam

Largest Switches Are Built for Boulder Dam San Francisco. The largest electric elec-tric switches ever built are being completed here for shipment to Boulder dam. First finished sections of the switches are now being tested at Stanford university. Each switch there are 12 of them must stand a charge of 850,000 volts, highest ever attempted. In actual service, estimates Augustus Au-gustus Bowie, president of the manufacturing man-ufacturing company making the appliances, ap-pliances, they will operate at 287,-000 287,-000 volts. They will be the only air-break switches Installed at the dam proper and are to be used for disconnecting the dam's power supply sup-ply transmission lines and oil swothes. The two largest "double" switches stand 27 feet high when opened and weigh 55,000 pounds each. The single switches have base lengths of 21 feet and weigh 30,000 pounds each. The singles cost $10,000 while the double ones cost $19,000.