458 Mr. T. H. Blakesley on a New Barometer, 



20(n-2) 5M) 20M) 



(n-lja ^i^i-3(n-4) ^ 4+ 3(n-l) ^ 3 ^ 



5n-7 2(10n-27) (n-2)(10n'-37n + 17) Oi \ 



5(n-3) 5n-9 QQ 3(n-3) 21 (n- 3) 



™4(n-4) ^ 4+ 7T=T ^^ + 2(n-2) ^ 2 ~~ 2(n-l) ^^i 



, (n-3)(2U 2 -57^ + 26) n4 ) 

 + 4(n-l) 3 ^ J 



+ *^^ 2 3(?i _ 1) C^i) 3(n _ 1)2 VJi^i 



3(n-l) Q2 ■ Sn-1 ( w -2)(3n-l)» \ 



4(n-2) ^ 2 . 2(n-l) ^ Hl 12(n-l) 3 ^ij ' 



in which we may assign to the multipliers X b X 2 , \ 3 any values 

 as constants, or as functions of n only, that we please. I will 

 only add here that the expression into which X 3 is multiplied 

 is to a factor the square of a known form of the quadrine ; it 

 is equal in fact to 



3(n-l) l W i" h 2* n-1 Wl 2'n-2 H2 i ' 



4 Wellington Square, Oxford, 

 October 10, 1888. 



LI. On a New Barometer, called " the Amphisbama." 

 By T. H. Blakesley.* 



THIS instrument consists of a straight glass tube of uniform 

 internal cross section, closed at one end and open to 



* Communicated by the Physical Society : read June 23, 1888. 



