14^6 



APPENDIX. 



«' bulk at that heat, as j to i ; and let its expanfion by one 

 *' degree at any other heat, as 65° — x, be to its bulk at 65°, 

 *' as Jx I — ^x to I ; let the expanfion of Mercury by one 

 *' degree of heat be to its bulk at 65°, as ^^ to i ; and let 

 ii ^' + ^-^^ be called G ; let the compreffion of fpirits of 

 " wine by the prefTure of 100 fathom of fea-water, 

 *' when the heat of the fpirits is nearly the fame as 

 *' that of the fea at the depth to which the thermo- 

 *' meter was let down, be to its bulk at 6k,°, as C to i; 

 the compreffion of the Mercury is fo fmall that it may 

 be neglected ; let the thermometer be let down N 

 hundred fathom, and when brought up and put into water 

 of 65° — F degrees of heat let the Mercury in the tube 

 ftand at E degrees; confequently the heat, as fhewn by 

 ** the thermometer, is 65° — F — E: and let the real heat of 

 " the fea at the depth to which it was funk be 65 — at degrees; 



<^ then65°-^=65^-F--E4-^-^^^^^+^^;^-p? 



" In this thermometer S=i 160 ; M=97 ; the expanfion of 

 ^' the fpirits ufed in making it by 1° at the heat of 65°, was 

 '*' found to be -^^ of their bulk at that heat; that is j- = 



" TTe » '^ ~ TTiS'o' ^^^^^^ore G= 1,01 3. From M. DeLuc's 

 *' experiments * it appears, that the expanfion of fpirits of 

 "** wine by 1° at any degree of heat, as 65° — .v, is to its 

 ** expanfion by 1° at 65", nearly as i -^ — to i : there- 



** fore, d ~-j' The comprellibility of the fpirits ufed for 

 ^' this thermometer at the heat of 58°, was found to be 



* Modifications de rAtmofphere, volo I. page 252, 



" exactly 



(C 



<c 

 (( 



