Sold Out
Rare & Unique Delbert Johnson Patent Inclinometer
Mantel clock style gravity inclinometer patented Feb. 17, 1931 by Delbert O. Johnson of Bloomington, California. 24 inch example with an aluminum frame. It is unknown why tinted lenses were used. One of only a handful known and the only example I’ve seen in the flesh. A rare and unique inclinometer.