WITH ELETATION. 
319 
the rebound of the wind. Probably a deep rim and a steep 
funnel are best from this point of view. 
3. — As regards the position selected for a gauge, a spot too 
open must be at least as unsuitable as one too sheltered. In 
very exposed situations the indications in windy weather must 
be quite unreliable. Mr. Stow records of a gauge which he 
fixed within five yards of the edge of a sea-cliff, that it caught 
‘‘ not much with land winds, and next to nothing in gales from 
the sea.”^ Mr. Symons, in his inspection of rain-gauges, uses a 
little instrument devised by himself, which, held in the gauge, 
detects any tree, building, or other object rising to an angle of 
46 degrees with the horizon, and he will not allow any gauge 
to be fairly placed which fails to pass the test of that instrument. 
Mr. Symons is no doubt right in the importance which he 
attaches to a certain degree of openness of situation, but I am 
disposed to think it equally important that within the angular 
limit of 40 or 45 degrees there should be as much shelter 
as possible. 
^ British BainfUll, 1870, p. 21. 
