Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . cuit is completedwhenever the vertical bar comes in contact with theplatinum point, A, immediately in front of it. Thistakes place as soon as the long battery circuit iscompleted by the operator at a distance, and theaxial magnet drawn into the coils. This instrument,even without the armature, is more sensitive thanthe receiving magnet of Professor Morse, and maybe used with some advantage as a receiving appa-ratus for the telegraph, 323. Axial Telegr
Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . cuit is completedwhenever the vertical bar comes in contact with theplatinum point, A, immediately in front of it. Thistakes place as soon as the long battery circuit iscompleted by the operator at a distance, and theaxial magnet drawn into the coils. This instrument,even without the armature, is more sensitive thanthe receiving magnet of Professor Morse, and maybe used with some advantage as a receiving appa-ratus for the telegraph, 323. Axial Telegraph. — Fig. 137 represents aform of telegraph in which the axial force is used, motion being obtained inthe manner described in 289. This is introduc-ed as a new instrument,and its originality is hereclaimed. Two uprightcoils, C, are supported ashort distance above thebaseboard. Entering these from below is a U-shapedrod of soft iron, fitted to be drawn up into the coils,under the influence of the galvanic current. Whennot thus drawn up, it rests on a spring, shown inthe cut, by which the instrument is rendered more Fis;. CLOCK-WORK AXIAL TELEGRAPH. 203 sensitive. A grooved roller, for carrying the paper,is seen above the coils. To the iron bar is attacheda blunt point, so as to project above its poles, in thecentre, and in opposition to the groove on the being made with the battery, the soft ironrises up within the coils, and marks the paper. Onthe whole, this form of telegraph is more sensitiveand efficient than the electro-magnetic, and less liableto derangement; from the absence of the lever, it isalso more compact. A small armature may be placedacross the coils above, as described in 290, by whichthe mark is made with still greater force; but in thiscase, the motion is partly electro-magnetic. 324. Axial Telegraph, with Clock-work. -—In Fig. 138, the axial telegraph is represented, with Fig. 138.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18
