Reports of the Massachusetts commissioners to the exposition at Vienna, 1873With special reports prepared for the Commission . on. This releases the armature lever B of the mag-net at Putney, and the semaphore at Putney indicates man at Putney then blocks his out-door signal to corres-pond, and again depresses the plunger h to show that the sig-nal from Barnes has been acted upon. This, however, throwsthe current from E instead of F upon the bell-wire, and theindicator at Barnes marks signal on at Putney. The system of check and control in the working of thisapparatus seems to be co
Reports of the Massachusetts commissioners to the exposition at Vienna, 1873With special reports prepared for the Commission . on. This releases the armature lever B of the mag-net at Putney, and the semaphore at Putney indicates man at Putney then blocks his out-door signal to corres-pond, and again depresses the plunger h to show that the sig-nal from Barnes has been acted upon. This, however, throwsthe current from E instead of F upon the bell-wire, and theindicator at Barnes marks signal on at Putney. The system of check and control in the working of thisapparatus seems to be complete. No one signal can be givenand acknowledo;ed without the concurrence of the sio-nal-menat both stations, and the chance of accident through its faultis reduced to a minimum. The system Tyer is in use on several of the English rail-ways, and on the Lyons and Eastern railways in France, and 476 EXPOSITION AT VIENNA. is highly spoken of by the managevs as well as by M. Amiot,the French inspector of telegraphs, in his report to which Ihave alluded. Plate XIV. illustrates its general appearance and working. Plate At the terminal station A, the receiver consists of twocoils of electro-magnets, G and D, both communicating onthe one hand with the ground through the medium of a EEPOET OF ME. EOBEET B. LINES. 477 trembling-sounder T, and on the other hand with the man-ipulator, to be hereafter described. Each of these coils isplaced above the centre of a permanent horseshoe magnet,whose poles N, S, touch lightly the exterior surface of theplatina, under the indications occupied, free, and containsa core of soft iron, at the upper extremity of which a lightneedle, d, g, also of soft iron, vibrates freely between the twopoles of the permanent magnet. The receiver at the intermediate station B does not differfrom that of the terminal station except in that the coil D^,giving the signals for the right track (in going from B to A)is placed above the coil G^, which gives the signa
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherbosto, bookyear1875
