. Electric railway review . on the 9-inch fog boxinsulator. No result. Porcelain fog bowl insulator arcedover at 55,000 volts when the middle petticoat was all petticoats on there was no effect. Nine-inch insulator covered with a thin film of moisturestood about volts, but arced over at about 55,000 volts. Creeping Distance. On the surface of a clean, dry petticoat 35,000 voltsformed an arc at a distance of inches; 57,000 volts formedan arc at a distance of inches. Conclusions. From careful observations of the tests, briefly outlined,the following conclusions were
. Electric railway review . on the 9-inch fog boxinsulator. No result. Porcelain fog bowl insulator arcedover at 55,000 volts when the middle petticoat was all petticoats on there was no effect. Nine-inch insulator covered with a thin film of moisturestood about volts, but arced over at about 55,000 volts. Creeping Distance. On the surface of a clean, dry petticoat 35,000 voltsformed an arc at a distance of inches; 57,000 volts formedan arc at a distance of inches. Conclusions. From careful observations of the tests, briefly outlined,the following conclusions were deduced: First: Under the climatic conditions as defined, anyinsulator used for 33,000 volts or over, i. e., any insulatorused within the limits of size manufactured at present, wouldhave to be cleaned every third or fourth year. It is doubtfulif even a very considerable increase in size would be of anyadvantage. Second: The use of the so-called fog boxes wouldafford a temporary relief on small insulators and increase the. Insulators for Exceptional Service—Three Types of Porcelain Insulators Subjected to Various Tests. Same insulator. Well covered with moisture from fogof night previous. Test voltage, 35,000. Very heavy staticflashes on the surface of the insulator. Not heavy enough tothrow the circuit-breakers. Porcelain Fog Bowl Insulator. This insulator was of special design, the idea being tomake use of the advantages obtained from the fog box andat the same time by making the fog box of porcelain andsupporting it on the under petticoat instead of the crossarmto reduce the sparking distance required to the fog box. Theseveral parts of this insulator were not cemented insulator was wiped clean and mounted on a piece of1-inch iron pipe. Test voltage of 35,100 volts thrown five minutes no effect. Salt spray turned on from endof box for five minutes. Water dripped from all of the petti-coats. No effect. With the transformers off dust was shakenon the i
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