the Barometric Fonnulce, Sfc. 



655 



Kenny's peculiar Formula, which dispenses with Hygrometric Observations ; also 



removes {z)from the right-hand of the Equation. 



t + tM 

 1 + 0-004 ■ 



Metres. 



^ = 18490-0jl + 0-002695cos2(/)| <j and 



1 + 0-0035 



X log ^7 



T + T 



13' ' 



> X 



Eng. ft 



^'ji+o-oooi8(r-r'j 



1 + 0-002222 ('-i^- 32 



^±(H.C.), Cent. 



z = 60664-0 1 1 + 0-002695 cos 20 i ^ 



and 



1 + 0002 (''-^-32 



> X 



^^°°^WMMr(33F)|-(H-C-XF^^- 



Kenny's peculiar Formula, which dispenses with Hygrometric Observations ; also 

 removes (z), the unknown quantity, from the right-hand side of the Formula, 

 adapted to the Latitude of Dublin = 53° 23' N. 



Enj. ft 



2 = 60616-7 -( 



1 + 0-0022222 (^^ 



-32 



and 



L 



1 + 0-002 f^'- 32 



Mog 



^ 



/3' 1 1 + 0001 (3 -3')!" 



±(H. C), Fahr. 



Batlet's Formula, adapted to Latitude of Dublin = 53° 23'. 



Eng. ft. /f A-f' 



^ = 60298-7 i 1 + 0-0022222, &c. ( -^ - 32 log 



/3' 1 1 + 0-0001 (3- 3') r 



Mr. Kenny's formula (-when there are no tables of horary correction) ought 

 only to be used near sunset, or two hours after sunrise. Bayley's formula can be 

 used with safety only for observations made near noon, during the fine weather 

 of the summer season, and when temperature is above the freezing-point. 



VOL XXIII. 4 E 



