Negretti and Zambra Boxed Anemometer
Medium speed airmeter with 4 division dial to measure up to 100,000 feet per minute, includes instruction sheet. Two vanes broken off, extant. Also, Troughton & Simms table sextant, Home Office stamp for 1931, sighting tube and filters missing.
H10cm (Anemometer)
Estimate $80-150