320 FEDESAL BËFOSTËB. �the defendant's apparatus, the set-screw is set orîginally ai a given point, to determine the extent of the vibration of the armature, and is not afterwards changed. But the appa- ratus is made with a set-screw, which can regulate the length of vibration of the armature, and it is used for that purpose, if used only once. Moreover, the claim is to the set-screw, or its mechanical equivalent, so arrangea as to be capable of making such regulation, and is a claim to the mechanical means, �The act of congress of March 19, 1868, authorized a renewal of the application made by Dr. Page, Pebruary 2, 1854, to the patent office, for a patent, "including therewith his cir- ouit-breakers described by him prior to said application." Such application shows the combination of a self-acting electrotome; that is, an automatic circuit-breaker, with a cnmpound and adjustable electro-magnetic core and a helix. The expression, "circuit-breakers described by him prior to said application," is to be understood by a reference to the petition to congress on which the aot was passed. That petition refers to an apparatus invented by Dr. Page, in 1836, 1837 and 1838, and states that a distinguishing feature of it was an automatic or self-operating circuit-breaker, and that it embraced other novel features. The petition refers to vari- ous publications, some of which were descriptions by Dr. Page of circuit-breakers invented by him. Those are the circuit-breakers intended by the act, and the word ""circuit- breakers" there includes such appendages or added instru- mentalities, so previously described by Dr. Page, as were calculated to make the circuit-breaker more efficient or perfect. �The apparatus which embraces the invention covered by the eleventh claim of the plaintiffs' patent is the one shown by figure 10 of the drawings of the patent. That identical drawing is found on page 258 of volume 35 of SiUiman's Journal, published January 12, 1839, in an article by Dr. Page, commencing on page 252. There is, in the text, on pages 258 and 259, a description of the manner in which the retractile force of the automatic circuit-breaker is adjusted, ��� �
