The Philosophical magazine; a journal of theoretical, experimental and applied physics . eter were here approached to within a distanceof from 0-01 to 003 millim.; for I thought that in the case inwhich the current rushes from both sides into the wire theremust be a place where both sets of waves meet. When the mi-crometer is placed just at this point, the tension on both sidesmust simultaneously reach the same height, and there is there-fore no reason for the formation of a spark here, while one maybe expected in all other positions. The spark indeed failed to appear when the micrometer was i
The Philosophical magazine; a journal of theoretical, experimental and applied physics . eter were here approached to within a distanceof from 0-01 to 003 millim.; for I thought that in the case inwhich the current rushes from both sides into the wire theremust be a place where both sets of waves meet. When the mi-crometer is placed just at this point, the tension on both sidesmust simultaneously reach the same height, and there is there-fore no reason for the formation of a spark here, while one maybe expected in all other positions. The spark indeed failed to appear when the micrometer was in-serted in the middle of the loop, and reappeared as soon as it wasmoved by only a few decimeters on either side. It is thus provedthat the path of the current is represented by the perfect arrows;and, on the other hand, the small retardation luhich the electricaldischarge-current experiences by traversing a wire of a few deci-metres is made visible. I first of all sought the conditions under which this experi-ment on retardation succeeds most strikingly. I found it best Fio-. 7. Hi. to use directly the discharge of a RuhmkorfFs apparatus, on theplan represented in fig. 7. The inducing current was produced Prof, von Bezolds Researches on the Electrical Discharge. 49 oy a Groves element, and the distance in the spark-micrometerF was made =2 millims., as neither larger nor smaller distancesgave such good results. Under these circumstances it was sufficient, in order to producea spark, if one wire D was even only 1 decimeter longer thanthe other. When, on the contrary, they were of the same length,a spark never appeared. Yet it can be instantaneously evokedif, by touching one of the wires with the knob of a Leydenjar, the symmetry of the two current-paths is disturbed. In these experiments also the material and thickness of thewire exerted not the smallest influence. Whether I used a sil-vered copper wire of 006 millim. diameter, or an iron wire of023, or a copper wire of 08 mill
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