Apparatus and methods for measuring electric waves . tethe work the most frequent use will be made of diagrams. In fig, 1, page 2, A,is an induction coll. B is anoscillating system with spark gap between tv/o brass balls about1 cm, in diameter connected to the ends of two brass rods uponwhich are two hollow spheres of copper made so that they can bemoved along the brass rods to or from, the spark gap. The rec-tangular formes,is of copper wire 2mm. in diameter and about 75cm., square with a spark gap LI, bisecting one side, on the ends ofwhich are fastened two small brass balls each about,5 cm.
Apparatus and methods for measuring electric waves . tethe work the most frequent use will be made of diagrams. In fig, 1, page 2, A,is an induction coll. B is anoscillating system with spark gap between tv/o brass balls about1 cm, in diameter connected to the ends of two brass rods uponwhich are two hollow spheres of copper made so that they can bemoved along the brass rods to or from, the spark gap. The rec-tangular formes,is of copper wire 2mm. in diameter and about 75cm., square with a spark gap LI, bisecting one side, on the ends ofwhich are fastened two small brass balls each about,5 cm. indiameter, TThen S is connected as shown by a conductorwith the brass rod R, and the oscillating circuit set to vibratingby turning the current from storage cells or other electricalsource thru the induction coil, oscillations are produced in S,which are shown by the sparking between the balls 1 and C, fig. 1,page S . Hertz explains this phenomenon as follows:- The elec-trical waves rushing thru the metallic conductor reach the ball 2 1. Fig. 1. Hertzian oscillating system. i 2 in an apprecialDle interval of time later than they reach halljl,that is, the chance of potential proceeding;; fron the induction coilreaches ball 1 in an appreciable shorter tine tlian the ball 2, thuscausing a difference of potential v/hich is shown by the resultingsparks which are produced in gap between 1 and 2. This is some-v;hat surprising v/hen we consider that electric v/aves in copperV7ires are propagated T;ith a velocity ?^vhich is approxinately thesame as that of light. To avoid confusion the sparks in the side circuit S,will be called side sparks. If the conductor G be flipped alongthe side circuit S, auay from, the ball 1, the side sparks willgrow fainter till a point symmetrically placed with respect to thegap is reached the side sparks entirely disappear. This verifiesHertzs explanation of the cause of the side sparks. Hertz then tried the side circuit without the metallicconne
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttheses, bookyear1906
