45, COBNHILL, E.G., AND 122, EEGENT STREET, W., LONDON. 107 



FIG, 117. 



Osier's Self-registering Anemometer and 

 Rain Gauge. 



Osier's instrument (fig. ] 17) consists of the vane, V 9 of a wedge-shaped form, 

 which is found to answer better than a flat vane ; for the latter is always in a 

 neutral line, and is therefore not sufficiently sensitive. At the lower end of the 

 tube, 2T, is a small pinion, working in a rack, r, which is moved backwards 



