*RARE* 12″ Happle Patent Bradford Union Inclinometer

One of only three (3) known 12 inch examples. A fantastic inclinometer with rare black finished dial. All vials are full, working and original (the main, curved vial has been secured with fresh plaster). Wood and brass retain most all of the original lacquer finish and the brass has never been polished. A very rare and special inclinometer patented April 5, 1904 by John Happle of Cleveland, New York.