HUMPHREY MACHINE

John Humphrey and Co. was a partnership from about 1868 until 1872, of John Humphrey and Lewis Herrick of Keene. By 1874 the firm had been renamed the Humphrey Machine Company and was manufacturing water turbines, pumps, machine tools, shafting and pulleys, woodworking machinery and log calipers. The company used its engineering skill to devise calipers which , according to 1882 brochure, were based n correct  mathematical principle and were thoroughly proven by actual tests by practical lumbermen during nearly forty years of use. The calipers calculated the volume of logs in board feet or cords, or both, (on opposite sides of the blades). The board measure scales were designed to "show the number of square feet of one inch square edge and parallel sided board which should be produced from ordinary straight and merchantable logs of different diameters and lengths while the cord scales showed content of logs in hundreth's of a cord.