In diameter, charged to a negative potential of at least 2000 volts, is supported between insulators in the open, usually at a height of about 2 metres. [Please select]
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In other words, if light is an electro-magnetic disturbance, all conducting substances must be opaque, and all good insulators transparent. [Please select]
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This leakage occurs both between the line conductors and at the insulators placed on the pole lines forming the line circuit. [Please select]
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The insulators are made either of glass or porcelain, and are of a peculiar form known as triple petticoat pattern. [Please select]
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The Mantis has outstripped humanity in her knowledge of thermic nonconductors or insulators. [Please select]
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A woodpecker in my vicinity has drummed for two seasons on a telegraph-pole, and he makes the wires and glass insulators ring. [Please select]
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As a rule, the top wire is set on insulators and used for telephone connection. [Please select]
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