Page:Federal Reporter, 1st Series, Volume 1.djvu/331

PAGE V. HOLMES BUBaLAB ALABM TBLEaBAPH 00. 328 �magnet, which changes its pôles at each vibration, and a vibrating armature of soft iron, attracted towards the pôles of an electro magiiet, when such magnet is charged, no change of pôles being necessary to effect the motion of the armature, and its weight causing it to fall away from the magnet when the circuit is broken. The former is the arrangement in volume 32 of Silliman's Journal, and the latter is that of fig- ure 8 of the patent drawings. �The specification states that, into the arrangement shown hy figure 8, an adjusting or set-screw may be introduced to regulate the estent of the vibrations of the armature, after ihe manner of the set-screw in the arrangement in volume 32 of Silliman's Journal. The same distinction is drawn in the specification, in reference to the vibrating armature shown in figure 9 of the patent drawings, which is an armature vibrating to and from an electro-magnet, and carried at one end of a horizontal spring, the magnet, when charged, drawing the armature down, and the spring carrying it up and away from the magnet, when the circuit is broken. Then, after thus describîng the vibrating automatic circuit-breaker, with the electro-magnetic bar, the permanent magnet, and the regulating set-screw, and two forms of vibrating armature, such vibrating armature vibrating to and from an electro- magnet, temporarily charged, and then losing its power of attraction, on the breaking of the circuit, the thirteenth claim limits itself studiously to adjusting or regulating the length of vibration of the armature of an electro-magnet. It discards ail claim to adjusting or regulating the length of vibration of the bar in the circuit-breaker, which has a permanent magnet. The specification plainly says that an electro-mag- netic bar, vibrating between the arms of a permanent mag- net, is not a vibrating armature, because it says that a vibrat- ing armature is preferable to an electro-magnetic bar vibrating between the arms of a permanent magnet, for the reason it assigns that when the permanent magnet is used, with the electro-magnetic bar, such magnet changes its pôles at each vibration, while with the electro-magnet and the vibrat- ing armature no such change of pôles occurs, the motion of the ��� �