428 



CONSTANTS OF NATURE. 



The value for London has been computed from Sabine's expeiiidenjs. (Phil. Trans, for 1828), cor- 

 rected by Bally (Mbdu of Ast Society, voL 71. 



Linmetre3 = 0".990933412( 1 — ^-^~-j X (l-fO. 0Q5307746X sln^ lat. ) 



Velocity generated by gravity (g) 

 in a mean solar second of time. . 



Do 



Do 



Do 



Do 



Do 



Do ^ 



At Paris, height = 60"^ = 



At Paris, height = 0™ = 



At latitude 0°, height = O" = 

 At latitude 45°, height = O" = 

 At latitude 90°, height = O"- = 

 At London, height = O" = 

 At London, height = 4)» = 



»>'.80942,003 

 9"'.80954,210 

 9^.78012,073 

 9^.20607,593 

 9^.83203,113 

 9-".81219,755 

 32". 19283,06.. 



0.99164,33331 

 0. 99164,87369 



0. 99034,42175 

 0.99149,52534 

 0.99264,32454 

 0.99170,62851 



1. 50775,91683 



^ In metres =9».78012073{ 1-^^-^) X (l 4- 0.005307746 X sin 'la*.) 



Theoretical velocity of sound (New- 

 ton's formula) in dry air, at ( == 



OOC 



Do 



Experimental velocity of sound in 

 dry air, at ( = 0° C : Dutch ex- 

 periments corrected, byLeConte. 



Do 



By Van derKijlk 



Do 



Density of gas; air = 1. Eeg- 

 nault's results corrected: 



Oxygen 



Nitrogen 



Hydrogen 



C62 



279.9602 metres per seconii 

 918.5210 feet per second . . . 



332.7167 metres per second 

 1091.610 feet per second . . . 

 332.6724 metres per second 

 109L464 feet per secoM... 



1.105612 ,, 



0.971346 



0.069269 



1..529100..^ 



2.44709,62631 

 2. 9630^914fi3 



2. 52207.47 



3. 03806,76 

 2.52201,67 

 3. 03800,96 



0. 04360,27 

 -1.98737,39 

 -2.84053,89 



a l&i43,59 



