rce of power. The these two roads has been well earned, and that twenty lens-holding devices consist of a vertical shaft carrying In an invention patented by Andrew Dinkel, of at its upper extremity an abrading disk upon which or thirty years ago they were easily first in their re- Auburn, N. Y.,an… … DINKEL’S POWER-HAMMER. than one of the great systems of the United States. THOMSON’S LENS-GRINDING MACHINE. The motive power of the Pennsylvania Railroad has provided, by means of which a strong yet yielding blow always been marked by strong individual character- by means of a belt and pulley…
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