Barton, Edwin H. (Edwin Henry), b. 1858 · London, Macmillan and Co., limited · leaf 656
eadying resistance, such as E, and any inductances thatmay occur in the main circuit of the arc, as in Simonsarrangement. 650. The details of Duddells arrangement of speakingarc are given by him as follows:— The microphone M was supplied by the NationalTelephone Co. and was intended for… … I _ -±- A S b B X/4/-0 Fig. 109.—Duddells Speaking Arc. B 400, resistance 1*53. Mutual induction 0*0253 henry.The condenser S had a capacity of 2 or 3 microfarads, forthe arc cored carbons were used 11 to 13 mm. diameter,the current being 10 to 12 amperes, and the arc length20 to 30 mm. To obtain…
Sound
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