Himalayan Journals, vol 2 by J. D. Hooker (android pdf ebook reader TXT) 📕

The Dale,* 6952 ft. 6 a.m. 45.6 41.4 4.2 .277

8 Nov. & Dec. ... 2 p.m. 60.0 48.3 11.7 .355

6 1848 ... 6 p.m. 50.6 44.7 5.9 .311

9 December, ... 2 p.m. 49.7 41.7 8.0 .280

19 1848 ... 6 p.m. 44.0 40.5 3.5 .269

46 ... ... Mean 49.9 43.3 6.7 .298

CALCUTTA

No. of

Obs. Place Elev. Hour Tp. D.P. Diff. Tens.

4 The Dale,* 6952 ft. 6 a.m. 67.9 64.7 3.2 .610

8 Nov. & Dec. ... 2 p.m. 83.3 65.2 18.1 .621

6 1848 ... 6 p.m. 77.3 63.1 14.2 .579

9 December, ... 2 p.m. 79.3 59.0 20.3 .505

19 1848 ... 6 p.m. 75.8 62.6 13.2 .569

46 ... ... Mean 76.7 62.9 13.8 .577

Dorjiling.--Humidity 0.798 Calcutta 0.640

,, Weight of vapour 3.40 gr. ,, 6.27 gr.

Comparison of Dorjiling and Calutta.

HUMIDITY

No. of Diff.

Obs. Month Dorjiling Calcutta Dorjiling

102 January -.795 .571 +.224

97 February .828 .590 +.238

40 March .940 -.438 +.502

23 April .684 .523 +.161

48 May .926 .698 +.228

40 June .895 .800 +.095

176 July .929 .800 +.129

167 August +.955 +.818 +.136

185 September .932 .760 +.172

74 October .950 .658 +.292

46 Nov. and Dec. .798 .640 +.158

998 Mean 0.876 0.663 +.212

WEIGHT OF VAPOUR IN CUBIC FOOT OF AIR

No. of Diff.

Obs. Month Dorjiling Calcutta Calcutta

102 January -2.68 -4.80 +2.12

97 February 2.75 5.40 +2.65

40 March 3.42 5.72 +2.30

23 April 3.98 7.65 +3.67

48 May 5.22 9.90 +4.62

40 June 5.39 10.17 +4.78

176 July 6.06 10.05 +3.99

167 August +6.25 +10.35 +4.10

185 September 5.72 9.88 +4.16

74 October 4.74 8.55 +3.81

46 Nov. and Dec. 3.40 6.27 +2.87

998 Mean 4.51 8.07 +3.55

It is hence evident, from nearly 1,000 comparative observations, that the atmosphere is relatively more humid at Dorjiling than at

Calcutta, throughout the year. As the southerly current, to which

alone is due all the moisture of Sikkim, traverses 200 miles of land, and discharges from sixty to eighty inches of rain before arriving at Dorjiling, it follows that the whole atmospheric column is relatively drier over the Himalaya than over Calcutta; that the absolute amount of vapour, in short, is less than it would otherwise be at the

elevation of Dorjiling, though the relative humidity is so great.

A glance at the table at the end of this section appears to confirm this; for it is there shown that, at the base of the Himalaya, at an elevation of only 250 feet higher than Calcutta, the absolute amount of vapour is less, and of relative humidity greater, than

at Calcutta.

SERIES II.--_Observations at various Stations and Elevations in

the Himalaya of East Nepal and Sikkim._

ELEVATION 735 TO 2000 FEET.

EASTERN NEPAL AND SIKKIM.

No. of

Obs. Locality Elev. Month Tem. D.P. Diff. Tens --------------------------------------------------------------------- 3 Katong Ghat. 735 Dec. 60.2 55.3 4.9 .447

Teesta river

2 Great Rungeet, at bridge 818 April 82.8 63.5 19.3 .588

1 Ditto 818 May 77.8 60.3 17.5 .528

3 Tambur river, E. Nepal 1388 Nov. 60.6 57.0 3.6 .473

1 Ditto 1457 Nov. 64.2 59.1 5.1 .507

6 Bhomsong, Teesta river 1596 Dec. 58.6 52.0 6.6 .399

1 Ditto 1596 May 68.2 66.4 1.8 .647

5 Little Rungeet