In 1876, Hartford Machine Screw was granted a charter "for the purpose of manufacturing screws, hardware and machinery of every variety." The basis for its incorporation was the invention of the first single-spindle automatic screw machine. For its next four years, the new firm occupied one of Weed's buildings, milling thousands of screws daily on over 50 machines. Its president was George Fairfield, who ran Weed, and its superintendent was Christopher Spencer, one of Connecticut's most versatile inventors. Soon Hartford Machine Screw outgrew its quarters and built a new factory adjacent to Weed, where it remained until 1948.