442 Inquiries into the Laws of Dilatation of Solids, Liquids, 



oil nrnear the meridian. But, if he will take the trouble to 

 calculate the pr.th of the niooii's sliadow, he will find that the 

 sun was centrally eclipsed on the meridiem in noith latitude 43° 

 6' 48"^ east longitude 29° 41' SO"; and that the central path of 

 the moon's shadow did not, at any time during its whole course, 

 enter any part of the Russian territories. 



I am, sir. 

 Your obedient servant, 

 London, Dec. 16, 1816. AsTTUONOMIClTe. 



XC. On the late Solar Eclipse. By E. Walker, Esq. 



To Mr. 711 loch. 



Dear Sir, — J. he following o".>servation on the solar eclipse, 

 of November H), 1816, was taken in latitude 52' 4j' 24" N. 

 and longitude 1' i^4",4 in cime, east of Greenwich. 



The beginning of the eclipse was uot observed, but the end 

 was taken, v/ith a forty-sin incii achromatic magniiving forty- 

 two times, at . . ' . . iO'' 25' 14",5 A.'M. per clock. 

 Clock too fast at iO'' 25' . . 3 9,66 



End of the eclipse .. iO 22 4,84 m. time. 

 The air \va.s very clear duriuc; the time of observation, and the 

 aperture of the oi)ject glass of ihe telescope being contracted to 

 two inches, the distinctness gained by this means was more than 

 aconijjeusation for tije low power ! used. And^ as I had an ob- 

 Bervatioa of the sun's fraxisi" ever the meridian on the same day, 

 the error of observaticn of tli'3 end of the eclipse does not, pro- 

 bably, amount to more than a second. 



J. an, c'ear sir, 



Yours respectfully, 

 Lynn, Dec. 10, 1816. Ez. WalKER. 



XCI. Inquiries into the Laws of Dilatation of Solids, Li- 

 quids, and elastic Fluids, and on the exact Measurement of 

 Temperatures. By Messrs. Dulong and Petit. Read to 

 ihe Institute 29th of' May 1816. 



[Concludei! from p. 380.] 



Of the Dilatation of Solids ut high Temper attires. 



JL HE knowledge of the dilatation of the metals, particularly of 

 the ductile metals employed in the construction of instruments 



and 



