. The telephone system of the British post office. A practical handbook . theinstrument is objectionable. A telephone was constructed by Gouloubitzky with four coils and twocircular magnets. The two ring magnets terminated in four coils, theopposite cores being of opposite polarity; in short, the instrument con- C 18 Ader Recetvev. sisted of two telephones with four coils acting on one diaphragm. Thereasoning which led to its construction was based upon the fact that whenseveral receivers are joined up together to receive music, etc., the sound isquite as loud on any one of the telephones as w
. The telephone system of the British post office. A practical handbook . theinstrument is objectionable. A telephone was constructed by Gouloubitzky with four coils and twocircular magnets. The two ring magnets terminated in four coils, theopposite cores being of opposite polarity; in short, the instrument con- C 18 Ader Recetvev. sisted of two telephones with four coils acting on one diaphragm. Thereasoning which led to its construction was based upon the fact that whenseveral receivers are joined up together to receive music, etc., the sound isquite as loud on any one of the telephones as when only one is joined was thought that the combining of two receivers in one would result indouble the volume of sound. This was not the case, however, and thisand many kindred forms of receiver have now disappeared from the regionof practical telephony. The Ader receiver is one of the most sensitive receivers in use to-day,and though not very extensively used in England certainly merits de-scription. It consists of a ringed-shaped circular magnet (E, Figure 8). Figure 8. the poles of which terminate in soft iron cores round which two coilsC and Ci are wound. Above the diaphragm D is placed a circular ringof iron B B^, the object of which is to concentrate the magnetic ring is termed the surexcHateur (over exciter). The term is asomewhat awkward one to translate, but its general meaning will begathered from the foregoing. This ring reduces the magnetic resistanceof the magnetic circuit and consequently increases the number of lines offorce passing through it. Du Moncel found that the nearer the mass ofan armature approached that of its magnet the greater was theirmutual attraction—, the greater is the magnetic field between them ;consequently if having designed our ring and magnet upon these lines weplace our diaphragm between them we shall have it placed in the strongest Adev Hecelver. t9 magnetic field which it is possible to obtain with this particula
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecttelepho, bookyear1901
