FOR CHRISTMAS.—The children must always nave something to make them merry on Christmas. Messrs. Turner Brother, SCS Chestnut street Philadelphia, have issued a neat and and verypretty tpok called " Christmas Day," with three poems; viz.:" 'Twas Night Before Christmas," "Christmas Day," and" TheNigntAfteVChristmas,"from Punch. It has a beau tifal cover, and is sent by mail for fifty e'e'n'ts. Improved Telegraph Instrument. The apparatus which we herewith illustrate is a combination of three distinct inventions, upon each of which a separate patent has been granted ; viz., the magnet, the sounder, and the key. They, together, constitute one of the most beautiful and efficient instruments of its class we have had brought to our notice. We will notice the parts of the device in the order above specified. The wire has, previous to this invention, been wound entirely around one spool, after which it was carried to the other, which was wound in like manner ; the current consequently passed through the entire coil on one spool before reaching the other. In this new system of applying the wire, both spools receive the current simultaneously ; the current passing alternately from one to the other. Greater power and quicker action are, therefore, secured by a battery of a power which, under the old system, would almost be insufficient to work the instrument. These advantages are secured by winding both spools at once. The spools are placed with their heads together, and the wire being started at the outer end of one spool is wound in a single layer over that spool, crossed over the heads of both spools, which are placed together, then wound over the second spool, and back, crossed over the heads again and wound over the first spool and back, again crossed over the heads, and so on until both spools are filled. In this way many connections are made between the two coils, and the wire, instead of being wound continuously on each spool separately, is equally distributed between both. The spools thus wound are set up in the ordinary manner. When the electric current is passed through the coils, it passes simultaneously around both spools, and both, therefore, act at once to attract the armature, instead of, as heretofore, one after the other. The action is thus! rendered more sadden, and powerful than in the method of winding, as heretofore practiced. It is scarcely necessary to add that this method is equally applicable to all kinds of electro-magnets for whatever purpose they may be employed, and whether spools, cores, or legs are used. The principal differences between the key, Fig. 1, and those in ordinary use are, first, the addition of a supplementary lever, A, pivoted to the principal lever, C, at B, the use of which is to make an indirect circuit while the instrument is not in use ; and, second, the insulation of the point of the adjusting screw, H, which limits the motion of the principal lever, C. A hard-rubber knob, D, on the principal lever, C,is separated by a coiled spring from a button of similar material on the supplementary lever, A. The latter has a foot, E, which rests against the standard, F, when the instrument is not in use, the points of contact being made of platinum. The current then passing through the standard, F, passes through E, and thence through C, and the spring attached to the standard, G, and so out through the wire. In use the knob, D, and the button on the supplementary lever, A, are pressed together, which breaks the indirect current, and the direct circuit, is then made and broken in the usual manner by bringing together a platinum point on the under side of the principal lever, and a similar point on the bottom of the slot in the standard, F, or rice wrsa, as the key is depressed or elevated. The insulation of the point of the adjusting screw, H, is necessary to prevent the current from passing through it from the standard, F, to the principal lever, C. The sides of the slot in the standard, F, are also insulated by plates of hard rubber, to prevent any danger of making the circuit by accidental contact of the lever, C, with them. This device, therefore, it will be seen, closes the circuit automatically when not in use. Fig. 2 represents a combination of an electro-magnet with coils formed as above described, with an improved sounding column. The armature, I, being alternately attracted to the'inagnet,' J, and withdrawn by the action of the spring, K, through the sounding bar, L, strikes L upon the end of a steel bolt, not shown in the engraving, which passes down through the bottom of the standard, M, and through the center of the hollow hard-rubber cylinder, N. This hollow rubber cylinder is surmounted by a brass cap, and rests on a brass ring, which, in its turn rests on the rosewood stand of the instrument, the whole being firmly held by a nut screwed on the lower end of the central steel bolt. Around this nut are borea sound-holes which communicate from the bottom of the rosewood stand with the interior of the hollow hard-rubber cylinder, N. This cylinder reinforces the sound made by the impact of the Bounding bar, L, upon the central steel bolt above described, in a remarkable manner, making it very distinct and clear; the sound waves formed in the interior of the hard-rubber cylinder, N, communicating freely with the external air, through the holes at the bottom of the stand above described. A screw, 0, limits the motion of the sounding bar, L, and a winding pin, P, in a double-slotted post, serves to regulate the tension of the coiled spring, K. The construction of this instrument involves some nice scientific principles, which cannot fail to attract the attention of electricians and practical telegraph operators. The patents for the three parts of this instrument we have thus described were taken out through the Scientific American Patent Agency; the one on the electro-magnet bearing date Nov. 9, 1869, and the patents on the key and sounding column July 6, 1869. The patentee is Mr. William Edward Davis, of 319 Newark avenue, Jersey City, N.J., where address him for further particulars.
This article was originally published with the title "New Publications"