102 Mr. Herschel's account of a series of observations 



July 21. The rockets much worse this evening than they 

 were last. Only one out of the whole number mounted at 

 all. All the others were seen, but nothing was sufficiently 

 definite to admit of being noted. * 



Rockets 



1 



2 



3 

 4 

 S 

 6 



7 

 8 



9 



lO 



App* Time I 



9'' 42'" 48.88 



II. 



48.8' 



- III. 



- - 48.8' 



Mean. 



48.8» 



Comparisons of Chronometer and Clock. 



Clock. 



!»» 9n> 50.88* 



Chronometer. 

 Before 9'' 13"" 

 After II 10 



19 7 9.93 



Mean Error and Rate of Sidereal Clock. 

 I •». Error. Rate. 



i;"* 26"". 



47-37 



+ 0.20' 



Comparisons from 20 to 21, +1.02 

 Chronometer fast i™ 17.63' 



* It is much to be regretted that some attempt at least to note them was not 

 made. Had it been done, this night's result, which is now dependent on a single 

 signal, might perhaps (as they were for the most part tolerably well observed at 

 Wrotham), have been placed nearly on the same footing with the rest. H.) 



X 



