Proceedings. 159 



Ordinary Meeting, February 21st, 1893. 



Professor ARTHUR Schuster, Ph.D., P\R.S., F.R.A.S , 

 President, in the Chair. 



In pursuance of a resolution of the Council, the meeting 

 was opened at five o'clock instead of seven o'clock, the usual 

 hour, as an experiment. There was a good attendance, and 

 a conversation took place as to the desirableness of the 

 meetings being occasionally held at the earlier hour, to suit 

 the convenience of members residing at a distance or 

 otherwise occupied in the evening. The general feeling 

 appeared to be in favour of the new departure, and a 

 suggestion that the meetings should be alternately held at 

 five and seven o'clock seemed to meet with approval. 



The thanks of the members were voted to the donors of 

 the books upon the table. 



Mr, J. Wilson, introduced by Professor SCHUSTER, 

 read a paper " On the Comparison between Maxima and 

 Minima of Temperature observed in different parts of Man- 

 chester during the period of frost, December 4th, 1892, to 

 January 28th, 1893." A discussion ensued, during which 

 the prevailing direction of the wind was mentioned as a 

 probable factor in the problem. 



A paper by Mr. B. Lean, B.Sc, and Professor H. B. 

 Dixon, M.A., F.R.S., "On the Length of Plame produced 

 in Explosions in Tubes," was read by the latter. A dis- 

 cussion ensued on the relation of the phenomena to coal- 

 mine explosions. 



