158 Barometric Observations. 
The thermometers suspended near the middle of the barome- 
trical tube were 34° higher than the inclosed thermometer at 
eight and nine o’clock, and 24° higher at twelve and one, aver- 
aging 3° above the basin. 
The observations made as usual by Colonel BEAUFoy, are as 
follow: 
- 
| Ther.|Ther. f 
1821. Baronet ste E i Wind. Denom. Weather. 
—_— 
829-523 | 57-5| 56:5! S.S.W. | moder./ Clondy. 
9 |29-523' 57-3159 | WebyS.|do. | Do. 
10 |29-525 | 58°7|61°5| S.W. | fresh. | Fine. 
11 |29:522;59- |64 | W.S.W. | do. Do. 
12 /29-520 59-765 | W.S.W. | do.  |Do. 
1 |29:517' 60° |65 | W.S.W. | do. — | Cloudy. 
Colonel Beaufoy has calculated the height. of Bushey above 
Leighton, from the July observations, to be about 247 feet. I 
observed with pleasure the attention shown to this subject by 
Dr. Burney ; I am however afraid the wheel barometer cannot 
be relied upon, but in the absence of a better instrument may be 
used with sore advantage if correctly compared with a good 
standard instrument previous to any removal from the situation 
it occupied at the time of observation. 
It appears to me that Gosport is too far from London to be 
used as a medium of transfer of the zero, provided full reliance 
could be placed on the barometrical calculations; but in the pre- 
sent state of our knowledge of the atmosphere, it would in my 
opinion be unsafe to trust to that mode of fixing the zero in 
London, even inthe shortest line that could be drawn to the coast ; 
and as the section of the river Thames is a most interesting ob- 
ject independent of our present inquiry, it is to be hoped that 
nothing short of actual levelling will satisfy the public in trans- 
ferring the zero from the coast to London. 
I have received a letter in the name of Mr. Ralph Tredgold, 
suggesting a more extended course of observations, to which I 
beg to state, that some arrangements have long been in train to 
render the advantages of the barometrical observations more ge- 
neral and certain, by which any person may render available as 
many observations every day as may be convenient to himself. 
I am, dear sir, yours very truly, 
To Dr. Tilloch. B. Bevan. 
METEORO- 
