The American journal of science and arts . relative weight and best form of the winding,the most advantageous mode of communicating the galvanic cur-rent to rotating magnets, &c. That the shape of the iron used in constructing galvanic mag-nets will tend to vary the result of their action, must be evidentupon reflection. If we take as an example a common horseshoegalvanic magnet, the most active parts are the two extremities;and although every portion of the iron contributes its effect frominduction, still this effect is continually decreased until it reachesthe center, when it is reduced to n
The American journal of science and arts . relative weight and best form of the winding,the most advantageous mode of communicating the galvanic cur-rent to rotating magnets, &c. That the shape of the iron used in constructing galvanic mag-nets will tend to vary the result of their action, must be evidentupon reflection. If we take as an example a common horseshoegalvanic magnet, the most active parts are the two extremities;and although every portion of the iron contributes its effect frominduction, still this effect is continually decreased until it reachesthe center, when it is reduced to nothing. If then we divide theiron in a magnet of this description (Fig. 1,) into five equal parts,the iron in A may be considered as nearlyinert, and that in B and C as more powerful,but still far inferior in power to D and part A, may then be considered as near-ly useless as far as its own original effect isconcerned, and useful only by acting as abond of union between the two extremitiesof the magnet by conduction. Any form of. Construction of Galvanic Magnets, 125 the magnet, then, which will diminish the weight of A, to thatquantity which shall be sufficient for the conduction of the mag-netic power between the poles and enable them to react uponeach other, will prove of great advantage in the construction ofthese magnets by diminishing the weight of iron while thispower remains the same. This has been partially attempted byMr. Davenport, who made the iron in his magnets rather thinnernear the center, and heavier at the poles. But the same effectmay be much more advantageously produced by giving the ironthe form seen in Fig. 2. Two straight pieces of iron,B and C, are welded to a smaller flat bar A, which *= is large enough to conduct the inductive effects ofthe two extremities upon each other, and by beingmuch lighter than B and C, lessens the weight ofthe whole magnet. There are several advantagesresulting from this form. The sides, B and C, be-ing straight, are cap
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