. American engineer and railroad journal . i :\l. VIEW oi Mil M w SPEED CHANGER, SHOWINGPADS FOB \ I IM III m. TO II Wen: OB MAi 1I1M FIC. 57.—EM) ELEVATION SHOWING OPERATING HAN-DLE MECHANISM, AND Ill G vn II HMENT, S. teresting form ol positive-drive variable-speed mechanism,recently perfected and placed upon the market by the NationalMachine Tool Company. Cincinnati. O., which fullflls these re-quirements. This device was designed by Mr. W. L. Schellen-liach. President of the company, and is similar in general prin- ple to the larger variable-speed countershaft, built by thisi ompany which
. American engineer and railroad journal . i :\l. VIEW oi Mil M w SPEED CHANGER, SHOWINGPADS FOB \ I IM III m. TO II Wen: OB MAi 1I1M FIC. 57.—EM) ELEVATION SHOWING OPERATING HAN-DLE MECHANISM, AND Ill G vn II HMENT, S. teresting form ol positive-drive variable-speed mechanism,recently perfected and placed upon the market by the NationalMachine Tool Company. Cincinnati. O., which fullflls these re-quirements. This device was designed by Mr. W. L. Schellen-liach. President of the company, and is similar in general prin- ple to the larger variable-speed countershaft, built by thisi ompany which was described in article VI. of this series (page229, June, 1903). The new mechanism differs from the for-mer, however, in hat it provides a smaller number of steps,although the speed range is fully as large. The most notice-able feature of this new device is its compactness in relation tothe capacity. The principle of operation is essentially that of the Schellen-back method of raising loose gears into mesh with the revolv-ing gears
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
