JoLY — On the Reading of Meteorological Instruments. 165 



Wind velocity, if treated by a Robinson's anemometer, might 

 be converted into and read as a vertical movement by an arrange- 

 ment like that described by Professor Perry (Practical Mechanics, 

 p. 241). "Wind pressure would be more easily dealt with. 

 . An anemoscope would also be needed. This might consist of 

 a disc, traversed by a metallic sector, attached to an exposed vane, 

 the position of the sector, and so the direction of the wind, being 

 ascertained by successive contacts. 



