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Page 74 - Suppose that a man speaks near a movable disc, sufficiently flexible to lose none of the vibrations of the voice; that this disc alternately makes and breaks the connection with a battery; you may have at a distance another disc which will simultaneously execute the same vibrations.
Page 117 - ... resistance to the passage of the current, and that it is absolutely stable at very high temperatures; that if the thread be coiled as a spiral and carbonized, or if any fibrous vegetable substance which will leave a carbon residue after heating in a closed chamber be so coiled, as much as two thousand ohms...
Page 123 - It worked, but only a few minutes, when it busted. That man sat around that shop and slept in it for three weeks, until he got his engine right, and made it work the way he wanted it to. When he reached this period I gave orders for the...
Page 131 - I have developed some striking phenomena arising from the heating of metals by flames and by the electric current, especially wires of platinum and platinum alloyed with iridium.
Page 135 - When wound in the form of a spiral it is as springy and elastic when at the most dazzling incandescence as when cold, and cannot be annealed by any process now commonly known. " For the cause of this shrinking and cracking of the wire is due entirely to the expansion of the air in the mechanical and physical pores of the platinum, and the contraction upon the escape of the air.
Page 115 - The invention further consists in placing such burner of great resistance in a nearly perfect vacuum, to prevent oxidation and injury to the conductor by the atmosphere. The current is conducted into the vacuum bulb through platina wires sealed into the glass.
Page 128 - ... lightened over all the city of Rome from the one corner to the other; and there was not so little a street but it gave such a light that it seemed two torches there...
Page 109 - We had to take this piece of carbonized thread to the glass-blower's house," he said. "With the utmost precaution Batchelor took up the precious carbon, and I marched after him, as if guarding a mighty treasure. To our consternation, just as we reached the glass-blower's bench the wretched carbon broke.