. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ole pieces, pass thn)Ugh the columns of brass f> />, and arefoHtened in ])osition by screws h.^ .-*,. Springs /• /•, and collars c- c, 306 fyvEyrroys or yrKon,\ tksla. aiv sli|>|)i(l oil tlu Iods, tlir latter s(.rvin;i to set tlie points of tlierods at [a certain suitable distance l>y means of screws .,, andthe former to draw the points a])art. When it is desired to starttlie arc, one of the larije rul)l)er handles// /i-, is tap])ed
. The inventions : researches and writing of Nikola Tesla, with special reference to his work in polyphase currents and high potential lighting . ole pieces, pass thn)Ugh the columns of brass f> />, and arefoHtened in ])osition by screws h.^ .-*,. Springs /• /•, and collars c- c, 306 fyvEyrroys or yrKon,\ tksla. aiv sli|>|)i(l oil tlu Iods, tlir latter s(.rvin;i to set tlie points of tlierods at [a certain suitable distance l>y means of screws .,, andthe former to draw the points a])art. When it is desired to starttlie arc, one of the larije rul)l)er handles// /i-, is tap])ed (piicklywith the ^haiid, whereby tlie pctints of the rods are brought incontact but are instantly separated by the springs /• /■,. Such anarranijenient^has l)een found to be often necessary, namely incases when the k. :m. f. was not larj^e enouj^h to cause the discharcfeto break through the gap, and also when it was (lesiral)le to ayoidshort circuiting of the generator by the metallic contact of therods. The rapidity of the interruptions of the current Mith amagnet depends on the intensity of the magnetic field and on the r^ 6 4M^. r,_Si^^ A Fk;. ni(i. {potential dilfeieiicc at the end of the arc. The interruptions aregenerally in such (juick Hiiccession as to produce a musical ago it was obscrye<l that when a ])owerful induction coilis discharged between the ])oles of a strong magnet, the ilischarge|)ro(hi((s a lond noise not unlike a small pistol shot. It wasvaguely stated that the spark was intensified by the j)resence ofthe nuignetic field. It is now clear that the discharge current,flowing for sfuin- time, was interrupted a great number of timesby the magnet, thus producing the sound. The j)henomenon isespecially marked when the field circuit of a large magnet or<lynamo is broken in a j)owerful magnetic lield. HIOU FREQUENCY AND HIGH POTENTIAL CURRENTS. 307 When the current through the gap is comparatively large, it isof advantage to slip on the
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Keywords: ., bookcentury1800, bookdecade1890, bookidinventionsre, bookyear1894
