MR. HUDSON’S HOURLY OBSERVATIONS ON THE BAROMETER. 583 
Sixth set of fifteen days’ Observations. July i4th to July 28th, 1831. 
I. Water Barometer. 
Times of 
Observation. 
Number of 
Observations 
at each hour. 
Water 
Barometer. 
Attached 
Thermometer. 
Immersed 
Thermometer. 
Subjacent 
Thermometer. 
Water Baro¬ 
meter cor¬ 
rected for va¬ 
pour. 
Difference of 
Water Baro¬ 
meter from 
Mean. 
h 
A.M. 1 
15 
inches. 
392-979 
64-3 
64-4 
63-9 
inches. 
401-194 
— •114 
2 
15 
392-985 
64-1 
64-3 
63-9 
401-146 
-•162 
3 
15 
393-019 
6.3-9 
64-3 
63-9 
401-125 
— •183 
4 
15 
393-055 
63-9 
63-9 
63-8 
401-161 
-•147 
5 
15 
393-198 
63-6 
63-6 
63-8 
401-223 
— •085 
6 
15 
393-348 
63-3 
63-3 
63-8 
401-304 
-•004 
7 
15 
393-464 
63-1 
63-0 
63-8 
401-366 
-j- *058 
8 
15 
393-469 
63-0 
62-9 
63-8 
401-344 
+ •036 
9 
15 
393-384 
63-4 
62-9. 
63-8 
401-368 
+ •060 
10 
15 
393-255 
63-8 
62-8 
63-8 
401-334 
+ •026 
11 
15 
393-081 
64-4 
63-0 
63-8 
401-324 
+ •016 
12 
15 
392-901 
65-2 
63-4 
63-9 
401-348 
+ •040 
P.M. 1 
15 
392-640 
66-1 
64-0 
64-0 
401-318 
+ •010 
2 
15 
392-494 
66-7 
64-4 
64-0 
401-336 
+ •028 
3 
15 
392-430 
66-5 
64-8 
64-1 
401-217 
-•091 
4 
15 
392-391 
66-5 
65-1 
64-2 
401-178 
-•130 
5 
15 
392-386 
66-5 
65-3 
64-2 
401-173 
-•135 
6 
15 
392-457 
66-4 
65-4 
64-3 
401-217 
—091 
7 
15 
392-591 
66-2 
65-4 
64-3 
401-297 
— •Oil 
8 
15 
392-804 
65-8 
65-3 
64-3 
401-401 
+ •093 
9 
15 
392-969 
65-4 
65-3 
64-3 
401-470 
+ •162 
10 
15 
393-046 
65-3 
65-2 
64-2 
401-520 
+ •212 
11 
15 
393-116 
65-0 
65-1 
64-2 
401-508 
+ •200 
12 
15 
393-157 
64-9 
65-0 
64-2 
401-522 
+ •214 
Mean .... 
392-943 
64-9 
64-3 
64-0 
401-308 
The attached thermometer is let into the moveable brass cylinder connected 
with the vernier and encasing- the outside of the glass tube. 
The immersed thermometer is secured within the tube of the barometer, a 
few feet below the general surface of the column of the water. 
The subjacent thermometer, by Newman, was placed immediately under the 
cistern of the barometer, and, its variations being found so very inconsiderable, 
it was registered only at intervals of four or five hours during the day, and the 
series completed for each hour by interpolation. 
4 f 2 
