Page:Blackwood's Magazine volume 001.djvu/338
METEOROLOGICAL REPORT.
The comparison between the first four months of 1817, and the corresponding months of 1816, as stated in our last Report, was considerably in favour of the present year. The reverse however is the case with the month of May, the mean temperature of which is at least 1½° lower than that of May 1816. This diminution in the average is owing not so much to great depressions during particular nights, as to a general decrease in the temperature of almost every night During May 1816, the Thermometer sunk repeatedly below the freezing point, which it has net done during the present month; but it rose also considerably higher on particular days. The Rime, which has been more than once observed this month, must have been produced, either by evaporation, according to the old theory, or by radiation, according to the new theory of Dr Wills, for the temperature of the atmosphere was never so low as the freezing point.
Meteorological Table, extracted from the Register kept on the Banks of the
Tay, four miles east from Perth, Latitude 56° 25′, Elevation 185 feet.
May 1817.
Means.
THERMOMETER. Degrees.
Mean of greatest daily heat, 53.903
cold, 38.741
temperature, 10 A. M. 49.129
10 P. M. 42.500
of daily extremes, 46.322
10 A. M. and 10 P. M. 45.184
BAROMETER. Inches.
Mean of 10 A. M. (temp, of mer. 53°) 29.578
10 P. M. (temp. of mer. 53) 29.614
both, (temp. of mer. 53) 29.606
HYGROMETER (LESLIE'S.) Degrees.
Mean dryness, 10 A. M. 25.322
10 P. M. 12.935
of both, 19.129
Rain, 3.054 in.—Evaporation, 2.525 in.
Extremes.
THERMOMETER. Degrees.
Greatest heat, 31st day, 57.000
Greatest cold, 17th, 33.000
Highest, 10 A. M. 3d, 54.500
Lowest ditto, 18th. 41.000
Highest, 10 P. M. 27th, 48.000
Lowest ditto, 18th, 36.000
BAROMETER. Inches.
Highest, 10 A. M. 7th, 30.160
Lowest ditto, 12th, 29.070
Highest. 10 P. M. 6th 30.180
Lowest ditto, 11th, 29.100
HYGROMETER. Degrees.
Highest, 10 A. M. 21st, 42.000
Lowest ditto, 12th, 7.000
Highest, 10 P. M. 3d, 23.000
Lowest ditto, 18th, 2.000
Fair days 17; rainy days 14. Wind west of meridian, including North, 17; East of meridian, including South, 14.
Meteorological Table, extracted from the Register kept at Edinburgh, in
the Observatory, Calton-hill.
N. B.—The Observations are made twice every day, at eight o'clock in the morning, and eight o'clock in the evening.
Ther.
Barom.
Attach.
Attach Ther.
Wind.
Ther.
Barom.
Ther.
l f M.41
29.842 .816
M.46 E.47/
E.
Fair.
May 17 {
M.42 E. 42
29.40G .465
M.49X E.49/
W.
Rain.
( lM'.44
.753
M.50X
N.W.
Fair, and
18 f IM.44
.470
M.46
Showers of
^^
E.49
.656
E. 52 /
very mild.
E. 38
.253
E. 45 /
snow.
'"{
M.50 E. 48
.516 .313
M.33 E. 53 /
N.W.
Rain.
19 {
M.43 E. 46
.290 .385
M.48) E. 50 /
W.
Fair.
<{
M.45 E. 43
.389 .575
M.51) E. 48 /
N.W.
Showers.
f
M.46 E. 43
.452 .489
M.521 E. 48 /
Cble.
Fair.
n
ft. 46 E. 42 M.45 E. 40
.430 .546 .746 .975
M.50X E.47/ M.501 E.47/
W. N.W.
Showers.and high wind. Fair, but very cold.
21 { {
M.46 E. 41 M.43 E. 43
.504 .407 .241
,i87
M.52X E. 4V/ M.47 X E. 48 /
E. E.
Fair, frost iu the morning.
Fair.
'{
M.48 E. 52
.980 .695
M.51 E. 45 f
s.w.
Fair.
23{
M.47 E. 44
!232
M.50 t. 49/
E.
Fair.
{
M.45
E. 4.>
776 .756
M.52
E. 49 /
E.
Fair.
M-46 F. 46
.170 .226
M.47
i .50/
N.E.
Rain.
M.45 E. 44
.682 .357
M.50 E. 50 /
Cble.
Fair.
25{
M.51 E. 45
.265 .287
M.S'.X E. 51
N.E.
Fair.
io{
M.45 E.47
.106 28.97.'>
M.49X E.51/
W.
Rain.
26.J
M.42
E. 4,5
.'290
M.46X E. 47 /
N.E.
Fair.
ll{
M.46 E. 45
29.151 28.978
M.51 E. 50 /
W.
Showers of hail, and cold
27{
M.44
F. 45
.353 .450
M.46X E. 48 /
N.E.
Rain.
12 {
M.41 E. 42
.889 .Ml
M.47X
E.47/
E.
Ilain.
28 1
E/45
.513 .69)
M.48X E. 48 t
N.E.
Fair.
13 {
M.41'29.211 E. 45l .338
M.45X
E. 48 /
Cble.
.Showers.
29 1
E'"J
.690!M.48 .76VJ-. 16 /
N.E.
Fair.
- j
M.48| .432 E. 42 .470 M.41 .465 E. 421 .534
E.'48/ M.44) E. 4.1 /
Cble. E.
Rain, with thunder.
Fair.
30 1 31 {
M.6 F. 43 M.47
E. 45
805 M.'19 .770F.43/ .698lM.50X .6l9lE. 51 /
N.E.
N.E.
Fair. Fair.
ir/
M.49I .630
M.51
.
Rai
n 0.309 in.
t
E. 471 .494
E.51/
W.
Fair.