384 REPORT OF THE COMMITTEE ON THE 



57' 2"'64 01ufsen,from the same, using compression ———• 



57' 2"'7G Henderson, from the same, using compression- — . 



57' 1"*80 Henderson, as above mentioned, from meridian observations at the Cape and 

 at Greenwich and Cambridge, in 1832 and 1833. This result depends 



upon an assumed compression, -— - , and gives the moon's mass , and 



300 ° 78-9 



the coefficient of lunar nutation 9"'28. 



57' 0"'43 De Ferrer, from fifteen occultations with meridian observations, and six corre- 

 sponding occultations. 



57' 2"-00 S. C. Walker, from Rumker's computations of the eclipse of May 14 and 15, 



1836, compression ^^^-IS ' 



R. M. PATTERSON, 

 S. C. WALKER, 

 R. T. PAINE, r 



ANDREW TALCOTT, J 



> Committee. 



Letter of Mr Cliarles Rumker to Mr John Faughan, Librarian of 

 the American Philosophicat Society at Philadelphia. 



Observatory, Hamburg. March 27, 1839. 



Sir: 



I have to apologize for the delay of the calculation of the valuable 

 American observations of the Solar Eclipse of May 1£, 1836, and 

 have now the pleasure of sending you them, together with those of a 

 number of European ones, that have partly been communicated to me 

 since. On account of the opposite parallaxes and latitudes of the moon, 

 her elements might, by a comparison of the American observations 

 with the European ones, be correctly determined. I have used in 

 the calculation, moon's latitude at mean noon at Greenwich, = 

 19' 43-"17, N., (T 's sem. ==14' 50-"4, o 's semidiameter = 15' 48-"4, 

 which is founded partly upon a comparison of all the observations, 

 partly upon actual measurement of breadth of the o 's illuminated 

 disc at the time of the greatest obscuration, and finally, upon a com- 

 parison of the calculation at places situate upon the borders of the an- 

 nulus, with the observations made there. 



Your most obedient servant, 



CHARLES RUMKER. 



