delivered the opinion of the Court:

The appellant, George H. Thurston, has appealed from a decision of the Commissioner of Patents rejecting all of the claims of his application. These read as follows :

“1. In a rock and ore breaker, the combination of a crusher shaft, a core portion removable secured thereto, and a mantle portion removably secured to the core portion, substantially as described.

“2. In a rock and ore breaker, the combination of a crusher shaft, a core portion removably secured to the crusher shaft and having an outer tapered periphery, and a mantle of chilled iron made in the shape of a truncated cone removably secured to the core portion, substantially as described.

“3. In a rock and ore breaker, the combination of a crusher shaft, a sleeve-shaped core grooved on its inner bore, key mechanism in the grooves of said core for removably holding the core in *317position, and a chilled cast-iron mantle made in the shape of a truncated cone removably secured to the core, substantially as described.

“4. In a rock and ore breaker, the combination of a crusher shaft provided with longitudinal grooves, a core portion formed in the shape of a truncated cone and having a longitudinally grooved bore, key mechanism for removably securing the core ¡portion to the crusher shaft, a mantle portion formed of chilled metal, one of such portions having a vertical groove with inclined walls at its lower portion and the other a lug to engage such grooves, and its inclined walls to removably hold the mantle in position, substantially as described.

“5. In a rock and ore breaker, the combination of a crusher shaft, a core made in the shape of a truncated cone having a central bore to fit the crusher shaft and locking grooves on its outer surface, the lower walls of which are inclined in opposite directions, and a crusher mantle formed of chilled metal and made in the shape of a truncated cone provided with a lug or projection to engage the locking groove of the core portion so as to be removably held in position, substantially as described.”

In his brief the appellant admits that claims 1, 2, and 8 were properly rejected, and confines his appeal to claims 4 and 5.

The decisions of the tribunals of the Patent Office fully and fairly discuss each of the claims originally contended for, in the light of the various references showing the state of the prior art, and further discussion by us would serve no useful purpose. We fully concur in the following extract from the Commissioner’s decision: “Claims 4 and 5 involve, in addition to the questions disposed of in connection with claim 1, the patentability of the structure set forth in claim 1 when provided with the specific pin-and-slot fastening devices of the Capen patent for retaining the mantle tightly upon the conical surface of the core. The application of the Capen fastening means to the mantle and core of the applicant’s machine is, so far as I am able to perceive, mere double use, and, in view of Hadfield and McCulley, 566,-464, is also an obvious substitution of substantial equivalents.” In antagonizing this view, the appellant contends that he has *318made á change which amounts to something more than a substitution of the Capen device; a change which, though slight, has been followed by new and most useful results. These results are not apparent. Moreover, the change is not made as in C. & A. Potts & Co. v. Creager, 155 U. S. 597, 39 L. ed. 275, 15 Sup. Ct. Rep. 194, upon which the appellant relies, by transferring an old device to use in an entirely different and unrelated art; nor is there anything in the record to bear out the assertion that the new crushing machine “has met with instant favor and large sales.” Such a fact, if proved, has often been held to determine patentability in case of doubt thereof, otherwise existing. We are advised of no case going any farther than that. See Durham v. Seymour, 6 App. D. C. 78, 92, and cases cited.

The decision of the Commissioner of Patents will be affirmed, and the proceedings herein certified to him. It is so ordered.