Meteorological observations and essays / By John Dalton.

  • John Dalton
Date:
1834
Catalogue details

Licence: Public Domain Mark

Credit: Meteorological observations and essays / By John Dalton. Source: Wellcome Collection.

    212/280 (page 186)
    Now, by applying the theorem at page 81, we tind the elevation of the upper barometer above the lower 9453 yards; whence, adding 103 yards, we get the height of Sheddaw above Derwent-lake = 956% yards, and its height above the sea comes out 10374 yards.—It had been a good deal of rain on the morning of. that day, and the clouds were just broken off at the time of the observations, the air remaining still very soft ; from which circumstance I am inclined to think that the height above deter- mined is rather too little; for I have found by repeated observations upon a hill 310 yards high, that the heights are found less by the theorem as the air is softer, ceteris paribus; I think there- tore we may conclude Skiddaw to be nearly 1000 yards above Derwent-lake, agreeable to Mr. Cros- THWAITE’S last measurement, till its height can be more exactly ascertained by a repetition of ob- servations.* * Mr. CrostuwaltrTeE makes the height of Latrig, another mountain in the neighbourhood of Keswick, to be 319 yards above Derwent-lake : by observations on the barometer the above-mentioned day, I found its height 312 yards, which, for the reason assigned above, is probably too little. Helvellyn is a mountain close by the road leading from Kendal to Keswick, about eight miles from the latter place; it has always justly been considered higher than Skiddaw. On the 27th of August I made the following observations to determine its height. At 1h 30m P. M. barometer at the summit, corrected as above 26.69 Barometer below, ten yards above Leathes-lake............ 29.39 A detached thermometer at the summit was .............. 4240 A detached thermometer below was..........ccc+ssevsecs 54. From which the elevation of the upper barometer above the lower