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By the end of his second year he had had his finger in many pies and had worked on about every sort of electrical contrivance then known: call bells, annunciators, galvanometers; telegraph keys, sounders, relays, registers, and printing telegraph instruments. Think what a rich experience his two years of apprenticeship had given him!" "You bet!" ejaculated Ted appreciatively.
All work should be frequently tested for continuity with telephones, magnetos, or small portable galvanometers. It is only necessary to ground the conductors at one end and try each wire at the other end.
Startling indeed it is to the scientist to be told that an artificial dream-world of the mathematician is more real than that he sees with his galvanometers, ultra-microscopes, and spectroscopes.
It was therefore urgently required that this should be remedied, and from this point of view the new mode of winding the wire is an important improvement introduced into medical galvanometers. La Lumiere Electrique. Every one knows that life exists in a latent state in the seeds of plants, and may be preserved therein, so to speak, indefinitely.
All who have been accustomed to the use of reflecting galvanometers will readily understand the difficulty, on account of its delicacy, of doing so where no special arrangements are provided for its use; but perhaps with a little indulgence on your part and patience on mine the experiments may be brought to a successful issue.
There was the Thomson reflecting mirror galvanometer and electrometer, while nearby were the standard cells by which the galvanometers were adjusted and standardized.
Once landed on the beach, the shore end was laid in the trench dug for it, one end of the cable entering the cable hut through a small hole in its flooring, where after some adjustment and much shifting of plugs and coaxing of galvanometers, the ship way out in the bay was in communication with the land, through that tiny place, scarce larger than a sentry-box, in which a man has barely room enough to turn around.
We looked with intense interest at this huge electrical pulse that felt every change over so vast and rich an area. "Passing a big dividing board," he went on, "they are distributed and connected each in its place to the delicate tangent galvanometers and sensitive indicators you see in this room.
In medical galvanometers the proportions are no longer the same, and the needle is always very near the directing helix. If this latter is square, or even elliptical, it is found that, beyond an angle of 15 degrees, there are differences of 4 or 5 degrees in the indications given with the same intensity of current by the same needle, according to the latter's intensity of magnetism.
"Yes, sir, I remember it well," responded Robin, "the room into which the conducting-wires from the ends of the cable are led to the testing-tables, on which are the curious-looking galvanometers and other testing machines." "Just so," returned Smith, pleased with his pupil's aptitude. "Well, on that table stands Professor Thomson's delicate and wonderful galvanometer.
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