measurement of Snowdon by the Thermometric al Barometer. 305 
and might be pegged down to the ground if occasion required. 
This precaution, though it had been needless on Snowdon, 
was of use on Moel Elio, where I had a very high wind. The 
tent has of course an opening on one side, where the instru- 
ment, which hangs from a hook in the centre, is accessible. 
S. Weald, 
June, 1820 . 
