. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . c printing telegraph, as long as anelectric current passes ; but when put into practice it was found that, if we may call it so, a sortof ink was formed which continued to mark after the current was broken, and consequently theobject aimed at, extreme accui-acy, was lost. In conjunction with Mr. Bashley Britten, altered the plan. Instead of making use of chemical decomposition by an electric current,they substituted metallic paper for the cyl
. Spons' dictionary of engineering, civil, mechanical, military, and naval; with technical terms in French, German, Italian, and Spanish . c printing telegraph, as long as anelectric current passes ; but when put into practice it was found that, if we may call it so, a sortof ink was formed which continued to mark after the current was broken, and consequently theobject aimed at, extreme accui-acy, was lost. In conjunction with Mr. Bashley Britten, altered the plan. Instead of making use of chemical decomposition by an electric current,they substituted metallic paper for the cylinder A, and a clockwork C for the weight. At aaaaof sketch are four electro-magnets made of the same material, in exactly the same manner, amatter of some importance, as we shall presently see. The keepers are attached to springs whichcarry metallic points ^^;3j9. When the electric current makes the iron magnetic, the keeper isattracted, and the metallic point presses gently on the paper ; one of the electro-magnets is in con-nection with an accurately-timed seconds pendulum, which at every beat makes connection for a 1772 fraction of a second, or, in other words, makes the magnet attract the keeper every second, and dotson the paper cylinder. Thns we have a second registered independently of the velocity with whichthe cylinder rotates. If the rotationis quicker, the two dots will be fartherapart, and vice versa. The three otherelectro-magnets are in electric connec-tion with three targets, one of whichis distant about 1 ft. from the muzzleof the gun, the second and third at 100or 200 yds., or at any other requireddistance. The first target consists ofa simple copper wire, which is brokenby the ball leaving the gun. Thetargets Nos. 2 and 3 consist of framesof common deal wood 6 ft. square,across which a copper wire passes back-wards and forwards close enough toallow no ball to pass through withoutbreaking it. These frames can beraised to such a height as the angleof
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Keywords: ., bookcentury1800, bookdecade1870, bookidsp, booksubjectengineering
