1894.] 



BEN NEVIS OBSERVATORY. — INSTRUMENTS, ETC. 



191 



INSTRUMENTS, ETC., 1894. 



Barometer No. 1385 has been in use throughout the 

 year ; No. 1285 being kept as a reserve instrument, a few 

 ■comparison readings were taken in May. 



Thermometers. Dry Bulbs 192677 and 535541, with 

 Wet Bulbs 192672 and 535542, were in regular use. Dry 

 861089 and wet 861090 were also occasionally used in the 

 beginning of the year. 



From July 4th l h to Oct. 18th l h inclusive, the large 

 Stevenson screen was in use ; for the rest of the year the 

 small screens on ladder stands. 



The tower screen was also occasionally used. 



Max. 117293 and min. 116918 were used in the large 

 screen. Mins. 138533 and 138545 in the small screens. 



Black Bulb 186 was in use during the summer. The 

 sunshine recorder has been in use throughout. 



The anemometers have not been in working order. 

 The driving clock is still used as the standard clock in the 

 office. 



Various forms of 5-inch rain-gauges have been ex- 

 perimented with during the year. 



The rainband has been observed every afternoon with 

 the small spectroscope. 



The Richard's barograph has been in regular use since 

 January 15 when the clock was returned after cleaning. 



The photographic camera has been at the Low Level 

 Observatory all the year. 



The depth of snow was measured as usual at post A. 

 till Dec. 22 when the post was broken by a squall. On 

 Dec. 23 a temporary post was erected a little to the south 

 of A. at which the depth has since been taken. 



Occasional readings have been taken with the Dust- 

 counter in Tower. 



The rainfall records are broken by the gauge being not 

 out sometimes in high winds and drift, otherwise the records 

 are continuous except that the tower screen readings have 

 beeii used once or twice in strong winds instead of the 

 Stevenson. The observations have been occasionally a 

 few minutes late. 



Mr A. J. Herbertson's hygrometrical apparatus consisting 

 of Balance, Aspirators, Drying tubes, etc., has been at the 

 Observatory all the year. 



Mr T. Marr continued the work with them in September, 

 and again in December. 



The telegraph cable has worked fairly well throughout 

 the year. 



The staff of the Observatory consists of R. T. Omond, 

 A. Rankin, J. Miller and R. Macdougall. Up to July 20 

 Sam. Weir and after October 12 T. Kay were also members 

 of the staff. Mr C. M. Stewart was in charge of the Obser- 

 vatory from June 30 to October 12. Messrs Russel and 

 Wilson also acted as observers for a time and G. Day and 

 W. Stewart as cook, etc. R. Macdougall acted as telegraph 

 clerk in summer. 



The only change in the routine observations is that 

 since June 19 a record has been kept of the visibility on 

 the following scale : — 



Summit only seen ..... 



Hills across Glen Nevis, Aonach More, etc. 

 Glencoe Hills Monagh Lea Hills, etc. 

 Mull, Cairngorms, Ben Cruachen, or Schie- 

 hallion ...... 



Jura, Rum or Skye ..... 



Ireland or Outer Hebrides 



