ee  —————— 
————————e ee 
ON UNDERGROUND TEMPERATURE. ao 
Zambra. It is a mercurial thermometer, with extra-thick bulb, imbedded 
in stearine, the whole being inclosed in a hermetically sealed glass tube 
with a perforated copper case for protection against breakage. 
Professor Harold Dixon, F.R.S., who has taken a leading part in the 
underground temperature work of the Coal Commission, has been added 
to the Committee ; and two old members, Mr. James Glaisher, F.R.S., 
and Sir C. Le Neve Foster, F.R.S., have been lost by death. Mr. Glaisher 
was one of the most active members of the Committee for the first fifteen 
years of its existence. 
Meteorological Observations on Ben Nevis.—Keport of the Committee, 
consisting of Lord McLaren, Professor A. Crum Brown (Secretary), 
Sir JoHN Murray, Dr. ALEXANDER Bucuan, and Mr. R. T. 
Omonp. (Drawn up by Dr. Bucway.) 
THE Committee was appointed, as formerly, for the purpose of co-operating 
with the Scottish Meteorological Society in making meteorological obser- 
vations at the two Ben Nevis Observatories. 
The hourly eye observations have been made at the high-level Obser- 
yatory by Mr. Rankin and his assistants uninterruptedly during the year. 
At the low-level Observatory in Fort William the self-registering instru- 
ments have been in continuous use throughout. the year, 
The health of the observers has been good. Mr. Robert H. Mac- 
dougal, who has been on the staff for many years, left the Observatory in 
December, and Mr. W. L. A. Craig Christie was appointed. The 
Directors desire to thank cordially Messrs. W. G. MacConnachie, A. J. 
Ross, and J. H. Buchanan for their valuable services as volunteer 
observers while members of the ordinary staff were on holiday last 
summer, 
The results of the observations made at the two Observatories during 
1903 are detailed in Table I. 
TasBie I. 
1903 | Jan. | Feb. | farch| April | May June | July | Aug. | Sept. Oct. | Nov. | Dec. | Year 
Mean Pressure in Inches. 
Ben Nevis Ob- 24-915] 25°232| 25-325) 25°555| 25°360) 25°189] 25-405 | 24-925) 25°315) 25-056) 25-210 
servatory 
Fort Wiliam 
Differences . 
25°099] 25°148 
29°475| 29-845] 29-863] 30:088)29°847| 29-659] 29°924/ 29°410) 29°915| 29-650) 29°760 
4:560| 4°613| 4°538| 4°533| 4°487| 4°470| 4°519| 4-485| 4600] 4°594| 4°550 
29-720 
4621 
29°726 
4578 
Mean Temperatures. 
° ° io} ° o is) ° o ° ° ° 
BenWevisOb-| 22:7 | 27:3 | 24°6 | 24°5 | 33:4 | 387 | 39°38 | 37°6 | 37°3 | 31:7 | 28:3 | 24:2 | 30°8 
servatory a 
Fort William | 38°5 | 43:2 | 41:5 | 42°7 | 49:7] 53:9 | 55°1 | 53:9 | 53°64 | 47-8 | 43:5 | 38°5 | 46°8 
Differences . | 15°8 | 15°9 | 16°9 | 18:2 | 16°3 | 15:2 | 15°3 | 16°3 | 163 | 161 | 15°2 | 143 | 16°0 
Extremes of Temperature: Maxima. 
Ben NevisOb-| 35:7 | 42°3 | 37:0 | 35°0 | 56°0 | 580; 49°6 | 49°0 | 50°0 | 40°5 | 41°9 | 36°6 | 58°0 
servatory / 
Fort William! 50°4 | 55°6 | 56°5 | 57-6 | 71:5 | 76:0 | 71:1) 63:8 | 680 | 60°0 | 55°5 | 54:0 |} 76°0 
Differences. | 14°7 | 13°3 | 19°5 | 22°6 | 15°5 | 180 | 21°5 | 148] 18:0 | 19°5 | 136 | 17-4 | 180 
Eatremes of Temperature: Minima. 
Ben Nevis Ob- 77 | 17:0 | 149 | 12°6 | 15:7 | 22:8 | 27°7 | 31:0 | 24°3 | 22°8 | 10°9 | 13:3 (HE 
servatory | | | | 
Fort William | 213 | 32:1 | 32:3 | 29°6 | 33:4 36:2 | 40:6 | 42:2 | 35°38 | 31:0} 235 | 224 | 21:3 
Differences . | 13°6 | 15:1 | 17-4 | 17:0 | 17°7 | 134] 12:99 | 11:2] 11°55 | 821 12°6 91 = 13°6 
