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Another important fact has likewise been ascertained, and that is that, under such circumstances, the magnetic intensity of the needle may change without the indications ceasing to have the same exactness up to 65 degrees. As well known, Mr. Desains has demonstrated that this occurs likewise in sinus or tangent galvanometers; but these have helices that are very large in proportion to the needle.
If the two poles of the battery were connected by the long conductor of six hundred and sixty miles, the precaution having been taken to divide it into two portions of equal length, it was observed, on connecting the two free extremities of these two portions in order to close the circuit, that the galvanometer placed in the middle was the first to be deflected, whilst the galvanometers placed in the vicinity of the poles were not deflected until later.
These impulses have been measured by delicate galvanometers and magnified millions of times by modern amplifying apparatus. Until now no satisfactory method had been found to study the passages of the impulses along the nerve fibers in living animals or man because of the great speed with which these impulses travel. Drs.
It was proposed to send powerful currents into the River Seine from batteries near the German lines and to receive in Paris upon delicate galvanometers, such an amount of their current as had not leaked away in the earth. Profs.
In a second series of experiments, Professor Wheatstone interposed three galvanometers in the middle and at the ends of the circuit, determining in this manner the progress of the current by the order which they followed in their deviation.
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