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He was prepared to believe in some exceptional, perhaps anomalous, form of exaggerated sensibility, relating to what class of objects he could not at present conjecture, but which was as vital to the subject of it as the insulating arrangement to a piece of electrical machinery.
The massive insulating doors were shut, the metal side of the mountain opened, and huge, squat caterpillar tractors came roaring and clanking into the room.
Tuning coils, sometimes called transmitting inductances and oscillation transformers, are of various types. The simplest kind is a transmitting inductance which consists of 25 or 30 turns of copper wire wound on an insulating tube or frame.
These radiations are largely absorbed by the vapour of water, and it is no doubt owing to this absorption that they are not found in the solar spectrum. On the other hand, they easily pass through gutta-percha, india-rubber, and insulating substances in general. At the opposite end of the spectrum the knowledge of the ultra-violet regions has been greatly extended by the researches of Lenard.
For purposes of insulation the wires were neatly covered with cotton-yarn and then saturated in a bath of hot gum-shellac, but this treatment proved defective in insulating properties, for when ten miles of line had been completed the wires were found to be wholly useless for electric conduction.
Soon one of them returned, dressed in an insulating suit, and carrying three sets of head harnesses, connected by multiplex cables to a large box which he placed upon the floor. He handed the headsets to the first officer, who in turn placed two of them at the feet of the Terrestrials, indicating to them that they were to follow his example in placing them upon their heads, outside the helmets.
The insulating strips in the commutator are sufficiently wide to demagnetize the whole of the machine before reversibility in the armature takes place, and this demagnetization sets up a direct induced current, which is caught in a shunt circuit by the aid of a second commutator, which only comes into action when the first commutator goes out.
As a result it was no uncommon thing to see bright sparks snapping between the chandelier and the lighting wires during a sharp thunder-storm. A startling manifestation of this kind happened at Sunbury, when the vivid display drove nervous guests of the hotel out into the street, and the providential storm led Mr. Luther Stieringer to invent the "insulating joint."
Some houses built on side-hill sites have at least one cellar wall more exposed than the rest. Where this condition exists, it is a real economy to cover the inside of it with insulating material. Either special plastering or fiber-insulating board can be used, as individual conditions warrant.
It has no shut-off control, and if it did have, I wouldn't use it. I will tell you why when we get back to the Solarite." At last they left the mighty machine; walked once more across its broad metal top. Here and there they now saw the ends of those quartz cylinders. Once more they entered the Solarite, through the air lock, and took off the cumbersome insulating suits.
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