VOL. LXV.J 



PHILOSOPHICAL TRANSACTIONS. 



629 



Barometer. 



Mod 



Jail. 



Feb. 



Marcb 



April 



May 



June I 



July 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



XVII. Extract of a Meteorological Journal for the Year 1774, kept at Bristol. 

 By Samuel Farr, M. D. p. 194. v .va.AA^T 



The bardmet^'^ wai placed 1 7 

 yards above the level of the river 

 Avon, which runs very near the 

 house. By vicissitude is meant 

 the greatest rise or fall of the 

 quicksilver in the smallest nun)- 

 ber of days. 



Dr. Farr had also given the 

 mean heights of the thermo- 

 meter within doors for every 

 month in the year. But these 

 are omitted, because observations 



Mean of the whole was 29.74' 



Rain. 



4.»)o I 

 5.549 

 5.297 

 2.349 

 ^..955 

 2.602 

 2.972 

 '2.V99 

 7.035 

 1.9.;7 

 1 .683 

 2.047 



42.366 



of the thermometer in the house are of no importance, unless accompanied 

 with corresponding ones of an instrument kept in the shade in the open air. 

 The air of a room, though kept without a fire, and so sitiiated as never to see 

 the sun, alters its degree of heat or cold so much more slowly than the external 

 air, that no judgment can be formed of the temperature of the one from that 

 of the other; except after a continuance of weather of the same kind for a long 

 time together, their mutual relation is vague and undetermiiied. Dr. Farr^ like- 

 wise sent a particular account of the winds and changes of the weather for every 

 day of the year ; from which I have composed the two following tables. 



S. HORSLEY. 



An Abridged Table of the Winds for Bristol, for the Year 1774. 



3 

 1 



i 





 



i 



2 

 

 i 



J 

 

 



N.W. s. E. N. E. s. w. Da. b cti 



Q <N 



H 

 H 



8 

 2 



4 



6'i 

 1 



4 



H 

 4 



2 

 3 



5J 



4J 



2 



1 



2 



4 

 10 

 -6 



5 



8 



8 42 53 92 123 



11 



5 



14^ 



2i 

 



6i 



7i 



13i 

 13i 



7 J 

 Hi 



4 



H 

 H 



l6i 

 17* 

 17^ 



7 

 I2J 



6 



6 



31 

 27 

 31 

 29 

 31 

 30 

 30 

 31 

 30 

 31 

 30 

 31 



>< 



•1 





Number of frogty 

 days. 



10 

 7 

 7 



Frost at timet. 



Frosty nightt, 



18 



42 



Thunder, February 16, 23, 24, s. w. — March 8, 20, e. 28, e. and w. 30, 

 E. and N. E. — April 27, with hail storm, s. w. and n.w. — May 1,4, n. e. 9, 

 10, E. 24, s. w. and s. e. — June 25, s. w. and s. — July 10, s. w. 26, n. and 

 N. w. — September 4, s. e. and n. e. 6, n. w. 12, s. w. and s. e. 



