B65-276 GRAVITY INCLINOMETER. Jensen Patent. One of the rarest and most attractive of the gravity inclinometers, patented by Niels Jensen of Minneapolis in 1890 and featuring a hanging weight in a semi-circular compartment that can be used either as a level or plumb. 24" cherry body, level and plumb vials in what look like maple inserts, both original and wet. Nickel plating on the rails has worn off; we've seen these replated and they're spectacular. From the collection of Dennis Fisher. Good+ 800-1600