In the earliest the conductor was represented by long metal wires, supported by silk or other insulating material, and left to pick up the air's potential. [Please select]
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A disc, D, of some insulating material--fibre or vulcanite--is mounted on the cam, or half-speed, shaft. [Please select]
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The base may be made of wood or any other insulating material and should have four short legs on the bottom. [Please select]
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Painting or enameling will improve not only their appearance, but also their insulating properties. [Please select]
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Drill a small hole through each of the lower end insulating washers. [Please select]
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I think the difference in insulating characteristics between the two materials probably accounts for the difference in size of the nests. [Please select]
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