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Kennedy was speaking rapidly and was careful not to pause long enough to give Prescott an opportunity to interrupt him. "These ultra-violet rays," he continued, "are always present in an electric arc light though not to a great degree unless the carbons have metal cores.
This defect has more than once been pointed out by us, and we are glad to notice any attempt to remedy an admitted evil. To this end we illustrate above a machine for manufacturing carbons, invented by William Cunliffe.
His thoughts came back always to the crucial point. "I got the paste brilliants," he muttered. "She got the real diamonds. She had them about her when I entered. She knew of the carbons, and she stalled me off with them. Lord, what a mug I was!"
One of these microphones is made as follows: Two flat plates of carbon are secured to a block of cork, insulated from each other; into a hole of each carbon a pin of carbon fits loosely, projecting above the carbons; another flat piece of carbon, having two holes in it, bridges over the two lower carbons, being kept in its place by the pins of carbon which fit loosely in the holes in it, the bottom carbons being connected with the battery; a block of cork has a flat side of it cut out so as when secured to the lower cork the carbons will not come in contact with it, yet be close enough to it to keep the carbons from falling apart.
It is not sharp, but surrounded by a halo which nearly obliterates the carbons. This arises from an imperfection of the glass lens, called its spherical aberration, which is due to the fact that the circumferential and central rays have not the same focus.
The zinc is always lifted out of the solution when the cell is not in use. The gas which collects in the carbons, and weakens the cell, can be set free by raising the plates out of the liquid when the cell is not wanted. Stirring the solution has a similar effect, and sometimes the constancy of the cell is maintained by a circulation of the liquid.
It is suited for the highest speeds, and this is very necessary, as the motors may with advantage, run at 2,000 revolutions per minute. One of the hinderances to the production of a regular and steady light in electric illumination is the absence of perfect uniformity in the carbons.
Hobart left them this morning before he went. Jolly decent of him to think of it, getting off in a hurry like he was.... He's not a bad young thing, do you think. 'Not so bad. Jane extracted carbons from a drawer and fitted them to her paper. Then she stretched, like a cat. 'Oh, I'm sleepy.... Don't feel like work to-day. For two pins I'd cut it and go out with you and mother.
Kennedy was speaking rapidly and was careful not to pause long enough to give Prescott an opportunity to interrupt him. "These ultra-violet rays," he continued, "are always present in an electric arc light though not to a great degree unless the carbons have metal cores.
And he then related how he had accidently discovered a new way to connect the wires, so as to get, from a dynamo and a storage battery a much stronger, and different, current than usual. "I'm making the searchlight now," Tom continued, "and soon I'll be ready to put in the lens, and the carbons." "And then what?" "Then I'm going to attach it to my noiseless airship, and we'll have a night flight.
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