1883.] Mr. R. H. Scott. On Barometrical Disturbances. 139 



[December 13, 1883. 



THE PRESIDENT in the Chair. 



The Right Hon. Lord Justice Sir Edward Fry, whose certificate 

 had been suspended as required by the Statutes, was balloted for 

 and elected a Fellow of the Society. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



I. "Note on a Series of Barometrical Disturbances which 

 passed over Europe between the 27th and the 31st of 

 August, 1883." By Robert H. Scott, F.R.S., Secretary to 

 the Meteorological Council. Communicated by desire of 

 the Council. Received December 4, 1883. 



Plate 1. 



The occurrence of sudden temporary derangements of atmospheric 

 pressure has been occasionally noticed at all observatories provided 

 with barographs, either mechanical or photographic. 



Among the most remarkable of these which have been recorded in 

 these islands have been that of January 16, 1869, which appeared at 

 Aberdeen, and to a less extent at Glasgow, and that of January 30, 

 1876, which was noticed chiefly at Armagh and Aberdeen, and was 

 described by me in a note published by the Meteorological Society 

 (" Quarterly Journal," vol. iv, p. 73). 



In both of these cases the depression of the barometrical column 

 amounted to about O'l inch, and the duration of the entire disturb- 

 ance to about ten minutes. In both cases the anemometers showed 

 sudden disturbances both in the direction and force of the wind, and 

 on the latter occasion certainly a shower fell. In 1869 no self- 

 recording rain-gauges existed. 



It is evident that both of these disturbances were due to the 

 passage of squalls. 



The phenomena which I have now to notice are very remarkable, 

 inasmuch as they are not accompanied by any traceable disturbance of 

 any other element than pressure, and they appear as clearly at 

 Coimbra and St. Petersburg as at our own observatories. 



The broad facts to be recorded are that at the end of August a 

 violent volcanic eruption took place in the Straits of Sunda (in 105° 



