. Scientific American Volume 03 Number 17 (October 1860). , he arranged a delicate lever, like, a steel-yard, to draw away the armature from the ends of thecores by means of a weight, and obtained the followingvery singular results; showing that the power of thecores under the combined action of the battery and per-manent magnet was greater than the sum of its powersunder the influence of the two separate. In the table our paper in just as neat and convenient form as if itwere bound. only necessary to make the articleknown to cause it to be generally adopted by people whowish to preserve
. Scientific American Volume 03 Number 17 (October 1860). , he arranged a delicate lever, like, a steel-yard, to draw away the armature from the ends of thecores by means of a weight, and obtained the followingvery singular results; showing that the power of thecores under the combined action of the battery and per-manent magnet was greater than the sum of its powersunder the influence of the two separate. In the table our paper in just as neat and convenient form as if itwere bound. only necessary to make the articleknown to cause it to be generally adopted by people whowish to preserve files, of valuable papers and to havethem always ready for reference. A portfolio is made of two stiff leaves, connected bya back of cloth, leather or other pliable substance. Tothe inside of one of the leaves are fastened two cords, aa (see cat prefixed), with metallic needles secured bythe middle at their ends. On the inside of the oppositeleaf are fastened at one end the elastic bands, 4 o, witheyes at their free ends tor the passage of the HOLCOMBS IMPROVEMENTS IH ELECTRO-MAGNETS. A permanent steel magnet, C, has connected withits two poles, A and B, the soft iron cores of twohelices, D and E. In front of the poles of these coresis placed the armature, F, to which is attached thestraight steel wire, g, operating as a spring by beingdrawn a little from a straight line between the twopoints to which the ends are fastened. Supposing the magnet is to be used as a relay magnetin telegraphing, the spring is so strained that it willjust balance the power induced in the cores by the per-manent magnet, in which case, the platinum point atthe end of the lever, h, to which the armature is attach-ed, will be neither fully in contact with the correspond-ing point on the standard, I, nor yet so far removedfrom it as to entirely break .the local circuit. Now ifthe electricity be so passed through the helices, D andE, as to add its force to the influence of the permanentmagnet,
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