Special Features:

Designed for 6000 ft max altitude; dial graduation 0 to 70, 10 ft smallest increment representation 0 equals 1000 ft on smithsonian meteorological table 51; w/wood carrying case; accessories 1 ea altitude correction chart, temp correction graph, sling psychrometer, conversion scale 1 ft to millibar, correction and conversion scale, adj tool

Properties:

A barometric type instrument consisting of a pressure sensitive element which contracts or expands in proportion to atmospheric pressure, connected through a linkage to a pointer. Its dial is graduated in units of linear measurement (feet, meters, and the like), to indicate differences of elevation only. Excludes altimeter, pressure.