. Appleton's dictionary of machines, mechanics, engine-work, and engineering. throughout the South and West by the enterprise of OReilly. The receiving magnet in its improved form, Fig. 3397, rised for the purpose of combining or connect-ing circuits, is closely allied in its construction to the call,and may therefore be described here, though already referredto in connection with Morses telegraph. The armature ismounted on an upright bar, and is seen forming part of thecross just in front of the poles of the horizontal electro-mag-net, surrounded with helices of fine wire. The long or tele-gr
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. throughout the South and West by the enterprise of OReilly. The receiving magnet in its improved form, Fig. 3397, rised for the purpose of combining or connect-ing circuits, is closely allied in its construction to the call,and may therefore be described here, though already referredto in connection with Morses telegraph. The armature ismounted on an upright bar, and is seen forming part of thecross just in front of the poles of the horizontal electro-mag-net, surrounded with helices of fine wire. The long or tele-graphic circuit is connected with these helices by means oftwo of the screw-cups on the board. When the current flows,fire armature is attracted to the magnet, and the upright baris brought in contact with the end of the horizontal screw,seen at the top of the instrument. This completes a localcircuit, or branch circuit from the main battery, the conduc-tors of which are connected with the instrument by meansof two other screw-cups, seen on the left of the board. The 30i) points of contact of the upright bar and screw are protected from oxidation by the use of platinum. TELEGRAPHIC COMPOSITOR. The experience of Bain and others, in transmitting signals byelectricity, has demonstrated that the amount of time requisite to send a message to a distant place, isnot dependent upon the speed with which the electricity travels, but upon the time in which the humanhand can perform the proper manipulations. This, in actual practice, as experience with the variousmethods in use has proved, has never reached an average of more than eighty letters per minute. Inthe mean time the researches in electricity have shown, that when the wave or pulsation is given to thecurrent by the finger, it flies to its destination with the swiftness of thought, though its path may bethousands of miles in length, and leading over precipitous mountains and through barren deserts. The telegraphic compositor was
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
