Lucius Quintus Cincinnatus Lamar

“ The main feature of my invention consist in the blade thus formed, with a flat front face and a moulded or fancy top surface the converse of the sole edge, and having the ridge, 1, or the ridges, 2, 2, either or both, extending across its top surface,-that is, extending from front to back, as shown in the drawings,-my improved cutter having a series of such blades, the cutting edges of each blade extending to one side of the cutter to adaptit for use on the edge of the sole next the upper, and each cutting edge having the same relation with the axis as all the others. ”

“ The flat front faces, a, of the blades are not radial, but are so inclined so as to make each blade slightly hooking, and thereby form a knife edge at the intersection of the flat front face with the top surface, c, and its ridges, 1, 2, 2. This is very desirable for if the front faces, a, be not so inclined the tool will be a scraper rather than a rotary cutter. The blades are made quite thick from front to rear, so that they may be ground back as they become dull, and they are ground only on their front faces, a, these faces being always maintained at substantially the same pitch. ”

“ It was decided that the use by the patentee of the wire so covered to conduct electricity was not a double use of the covered wire, nor a use for a purpose at all analogous to any before made of it; but that it was an entirely new use, the result of a discovery that gutta-percha was an electrical non-conductor, evolved by original thought, totally different from its quality previously known and applied, as a mere mechanical protector from external injuries. ”