Transactions of the Geological Society, 1st series, vol. 4/Barometrical Measurements
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By WILLIAM ALLEN, F.R.S
member of the geological society.
The following measurements were made with a single Barometer of the construction proposed by Sir Henry Englefield, and have been calculated according to the formula recommended by him in his memoir on the subject, which is inserted in the 14th volume of Nicholson's Journal. I shall give in detail the observations made upon Snowdon; and of the other measurements I shall mention only the results.
Snowdon.  
Observ.  Hour  September 8th, 1806  Therm.  Barom.  
1  A.M.  9  00  Goat Inn, Beddgelert  61  29.69 
2  ——  10  25  Llyn Cader  61  29.162 
3  P.M.  1  25  Summit of Snowdon  50  26.164 
4  ——  4  00  Llyn Cwellyn  56  29.30 
5  ——  4  45  Llyn Cader  57  29.12 
6  ——  6  00  High watermark at PontaberglasLlyn  55  29.78 
7  ——  6  30  Goat Inn at Beddgelert  53  29.6 
It appears from observations 1 & 7 that the Barometer had fallen at Beddgelert in 9 hours 0.09 inches, and from observations 2 & 5 that it had fallen at Llyn Cader in 6 hours 0.042 inches. The descent of the mercury may therefore be estimated at about 0.008 inches an hour, for which due correction has been made in each observation on calculating the measurements.
Feet.  
From Observations 6 and 7, the height of Beddgelert Inn above high watermark  = 162.7 
From Observations 1 & 4, the height of Llyn Cwellyn above Beddgelert  = 314.2 
above the Sea  = 476.9 
From Obs. 1 & 2 
From Obs. 1 & 3 
mean  
The height of Llyn Cader above Beddgelert  489.3  480.2  484.7 
above the Sea  652.  642.9  647.4 
From Obs. 1 & 3 
From Obs. 3 & 7 
mean  
The height of Snowdon above Beddgelert  3457.5  3409.  3433.2 
above the Sea  3620.2  3571.7  3595.9 
In the following measurements only one observation was made at the lower station, unless the contrary is stated.
Cader Idris.  
The height of the highest Peak above Dollgellau  2879  
The height of the highest of the three Heads above Dollgellau  2840  
Ingleborough  
The height of Ingleborough above the Bayhorse Inn, Ingleton  1881  
Ingleton is 90 feet below Settle; the height of Settle has been accurately taken, and is stated at 621 above the sea; therefore the height of Ingleton above the sea is  531  
and the height of Ingleborough above the sea is  2412  
Whernside  
The height of Whernside above Ingleton  1930  
above the sea  2461  
Peny gant.  
The height of Peny gant above Settle  1858  
above the sea  2479  
Shap Fells.  
The height of the highest point in the road between Kendal and Shap above Kendal  1187


Helvellyn.  
From two observations made the same day at Paterdale.—Day rainy.The Barometer varied .194 in 5 hours.—The Inn at Paterdale is 24 feet above Ullswater.  
The height of Grisdale brow above Ullswater  988  
──── of RedTarn  1935  
──── of the top of Helvellyn  2686  
Saddleback.  
Threlkeld, where the first observation was made, is 235 feet above the level of Keswick Lake, which is 228 feet above the sea.  


Skiddaw.  
The Oak Inn at Keswick, where the first observation was made, is 28 feet above the lake, which is 228 feet above the sea.  

XIX. Barometrical Measurements.
By SAMUEL WOODS, Esq.
member of the geological society.
[Read 19th November, 1812.]In the following measurements only one observation was made at the lower station, unless the contrary is stated. They are calculated according to the formula of Sir Henry Englefield.
Branch of the Mendip hills just above and eastward of Cross; the point appears to the eye to be one of the highest in the Mendip range. Height above Cross  670

Helvellyn.  
Height above the sea  
Feet  
Dunkerry Beacon, one of the highest points of Exmoor, near Minehead. Weather cloudy, with light rains. From two observations, one at Porlock Quay, the other at Minehead Quay, the Barometer had fallen 0.14 inches in 5 hours  1784 
Top of Brendon hills in the road between Minehead and Dulverton  1210 
North hill above Minehead  1000 
Highest point in the road between Barnstaple and Ilfracomhe  900 
Linton Churchyard, in the North of Devonshire  428 
Exmoor, about 4 miles south of Linton; one of the highest points on the Devonshire side of Exmoor  1608 
Hill called Hangman, near CombMartin  1093 
Hill about 1 mile east of the Hangman  1168 
Yester, near Okehampton, one of the highest points of Dartmoor, above the Inn at Okehampton, 1561 feet  2077 
The height of the Inn at Okehampton  516 
Hastings, Sussex.  
General Roy's station near the Windmill on Fairlight Common  588 
East Cliff  190 
Hill above the East Cliff  313 
Castle Hill  180 
Castle Cliff  135 
Dover.  
Western height  382 
Shakespear's Cliff  310 
Summit of Castlehill, beyond the turnpike  390 
Dorking, Surry.  
Heights above the bed of the Mole.  
Feet  
Boxhill about  300 
Headley Church, and the highest part of the wood on Mickleham Downs  466 
Norbury park  292 
Bench beyond the summit of the park  320 
Leith hill tower  803 
Beech Trees on the south side of Headley Common  585 