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Updated: August 9, 2024
The current is made to pass into the series of voltameters by means of a commutator, and its intensity is shown by a Deprez galvanometer. The voltameters, as shown in the diagram, are mounted in derivation in groups of two in tension. The spirits traverse them in two parallel currents.
The after current in the former case, however, is much smaller, consisting of one electrical impulse only at each break of the commutator, whereas in the alternating system these impulses are practically continued; the result being that, all things being equal, a far greater number of lamps may be used in the shunt than when supplied by continuous current only, and it would appear that this difference can only be attributed to the fact that the rotatory motion of magnetic molecules, or polarity of the magnet, E, acquires momentum when acted upon by a suitable physical cause, such as alternating currents of electricity; this momentum lasting a sensible time after the cessation of the acting cause.
I'm a competent mechanic, too. At least I thought I was before this happened. "Perhaps," said Geoffrey, "you didn't put the commutator back right after you took it out. I've known people make mistakes about that." His suspicion was unjust. The commutator was in its place and the wire terminals correctly attached. He took it out again, cleaned it, oiled it, and replaced it.
The current is drawn off from the ring by two copper "brushes" b, be which rub upon the bars of the commutator at opposite ends of a diameter, as shown.
Hopkinson and Muirhead differs little in general construction from that we have described; except that the commutator is very much simplified, and the armature bobbins are placed opposite each other on both sides of the rim. Instead of forming the coils into complete bobbins, Dr.
He laboured in vain. The engine did not respond with so much as a gasp. "The next thing I did," said the girl, "was to take out the commutator and clean it. But I don't advise you to do that unless you really do know something about engines." It was Geoffrey's turn to feel a little irritated. "I'm a competent mechanic," he said shortly. "All right," said the girl, "don't be angry.
P is the pile; C is the dial; and A is the commutator. It is evident that this apparatus will likewise be able to render services in scientific researches and laboratory operations, by sparing the operator the trouble of continually consulting his watch. La Lumiere Electrique.
When the signal is "line clear" the passage of the brush over the fixed contact produces no result; but when the signal marks "danger," the commutator brings the negative pole of the battery in direct communication with the ground, and when the brush passes over the contact the completion of the electric current causes the whistle to be sounded, so as to alarm the driver. L'Ingen. Univ.
The commutator had 73 sections. The armature resistance was 0.0092 ohm, of which 0.0055 ohm was in the armature bars and 0.0037 ohm in the end-disks."
Stern worked the better part of a week with such tools as he could find or make he had to forge a wrench for the largest nuts "taking down" the dynamo, oiling, filing, polishing and repairing it, part by part. The commutator was in bad shape and the brushes terribly corroded.
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