314 Scientific Intelligence. [Apri^ 



effect. Is any damage to be expected from the sudden condensation 

 of the steam on its first application to the cold water : 1 have been 

 told that the pipes are liable to burst from this cause; a circum- 

 stance which I think Count Rumford never mentions in his essays 

 on this subject. 



One more query, and I have done. Has any experiment been 

 published which ascertains the smallest object or angle that is per- 

 ceptible to a sound unassisted eye, or an eye assisted with a given 

 magnifying power ? In a philosophical work translated from the 

 French I have read that the eye is incapable of perceiving an object 

 which subtends an angle of less than half a minute of a degree. 

 I remain, Sir, most respectfully, your obliged servant, 



Feb. 3, 1815. M. 



V. Meteorological Table. From the Register kept at Ktnfauns Castle, 

 N. Britain. Supposed Lat. 56" 23-^'. Above the Sea 129 feet. 



Barometer. 

 Observations. fVind. 



Highest, May 11 SE . 



Lowest, Jan. 16 .... SE . 



Highest, May 10 E . 



Lowest, Mar. 2 .... SE . 



JVeathT. Bays. 



Kair 215 



Rain or Snow 150 



365 



ANNUAL RESULTS, 



MORNING. 



Thermometer. 



Wind. 



.30-64 July24 SE 



2S 70 Jan, 14 W. 



...64 

 ,. 12 



EVENING. 



30-65 I July 25 S E 



28-91 Jan, 15 W 



65 

 12 



Wind. 



N and .N E 



E and S E 



S and S W 



W and N W 188 



Times. 

 . .S 

 , 109 

 . 65 



365 



Extreme Co!d and Heat, by Six's Thermometer. 



Coldest, 14th January 7* 



Hottest, 24th July 76 



Mean for 1814 -15-168 



