. Appleton's dictionary of machines, mechanics, engine-work, and engineering. n this telegraph is merely to produce correspondence of motion in ma-chinery at different ends of the line, in the same manner that uniformity of rate has been secured inclocks at different places, regulated by the electro-telegraphic current. All the mechanical results ofHouses telegraph are produced by local mechanical power. For thi3 purpose, clock-work, having aregular rate, would be preferable to manual power. Horns igniting telegraph.—The register invented by G. H. Horn employs a principle never beforeapplied t
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. n this telegraph is merely to produce correspondence of motion in ma-chinery at different ends of the line, in the same manner that uniformity of rate has been secured inclocks at different places, regulated by the electro-telegraphic current. All the mechanical results ofHouses telegraph are produced by local mechanical power. For thi3 purpose, clock-work, having aregular rate, would be preferable to manual power. Horns igniting telegraph.—The register invented by G. H. Horn employs a principle never beforeapplied to the telegraph, namely, the heating or igniting effect of electricity. When an electrical cur-rent flows through a fine platinum wire it ignites it, or brings it to a red-heat. If this wire is bent, asat A, in the figure below, so as to be in contact, for a short distance, with a moving fillet of paper, itwill burn a hole through the paper when the current passes. This can be done with great rapidity, soas to represent probably a hundred linear letters per minute. This instrument is shown in Fig. 3399, the greater part of which consists of the clock-work, spool, &c,required for moving the paper. Above the clock-work are two pillars, supporting an axis, upon whichis the adjustable wire-holder, the lower extremity of which is seen touching the fillet of paper. Bymeans of the connections and insulations of the pillars, axis, and wire-holder, the platinum wire, whichpasses over a little slip of porcelain at the end of the wire-holder, becomes part of the circuit, withwhich the two screw-cups on the right of the base-board are connected. When the wire needs adjust-ment, the wire-holder can be turned up on its axis. The bed supporting the fillet of paper is also ad-justable, so as to regulate the contact between the wire and the paper. This register requires a quantity current to produce the effect of ignition, and therefore needs a re-ceiving instrument and local battery,
Size: 1777px × 1407px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
