for determining the djffereyice of meridians, &c. 99 



July 18th. The first, seventh, ninth, and tenth rockets 

 could not be observed ; one or tv^^o exploded without ascend- 

 ing ; the remainder did not explode at all. 



Comparison of Chronometer and Clock. 



Chronometer. 

 Before 9* 37" 

 After II II 



Clock. 

 i7>»22°' 3.55' 

 18 56 18 95 



Mean Error and Rate of Sidereal Clock. 



Mean of 6 ♦* 

 i6''o° 



Mean error. 

 47- 30* 



Mean rate. 

 — 0.26* 



Comparison from the 17th to i8th — 0.93. 

 Chronometer fast i" 18.07'. 



