G34 



MR R. C. MOSSMAN ON 



2 miles S.S.E. is Stob Ban (3274 feet), and the same distance S.W. Mulloch 

 nan Coirean (3077 feet). On the east the valley is closed by the precipitous face of 

 the Meall Cumhann (230G feet), while still farther to the east is the wide and bleak 

 elevated plateau of the Moor of Rannoch. The river Nevis lay some hundred yards 

 north-east of, and some 20 feet lower than, the station, and a few yards to the east 

 was a mountain torrent. From this description it will be clear that the station was 

 practically in the bottom of a cup-shaped basin, and that any wind that blew had to 

 come over a high mountainous range before reaching the station. To the west, in the 



Fig. 1. — The Ben Nevis District, from SymorCs Meteoro- 

 logical Magazine. A, Achariach : B, Ben Nevis 

 Summit ; C, Fort-William Low-level Station. 

 This map includes 7 miles by 5J. Contours at every 



500 feet ; above 1000 shaded, and above 3000 darker 



shading. 



direction of Fort- William, the valley some short distance below Achariach widened 

 considerably, but winds from this quarter were probably in the majority of cases south- 

 west winds deflected. 



Instrumental Equipment. 



The two Stevenson screens were placed on a slightly raised piece of moorland with 

 a fairly dry subsoil. The larger screen contained a Richard thermograph and hygro- 

 graph, while in another screen of the ordinary size were exposed the maximum and 

 minimum self-registering thermometers and the dry and wet bulb thermometers, with 

 the bulbs 4 feet above the ground and 154 feet above mean sea-level. 



A black-bulb solar radiation thermometer in vacuo was fixed in a brass frame 

 screwed to the roof of the larger thermometer screen, and a terrestrial minimum 

 thermometer with a bright bulb was placed on the ground. There was a copper 

 lain -gauge 5 inches in diameter, and after 2nd December readings of an anemometer 

 kindly presented by the inventor, Mr W. H. Dines, F.R.S., are available. The 

 barometer (hung in the living-room of the cottage, with its cistern 150 feet above 



