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



July 14. 



Rockets. 



I 



2 



3 

 4 



5 



6 



7 

 8 



9 



ID 



App* Time I. 



9" 31' 

 42 



51 

 10 I 



12 

 22 



31 

 42 



52 



2 



II 



>59.o» 



0.7 



59.0 



58.8 



3-4 

 3-2 



59-4 

 2.4 



0.3 

 1.8 



II. 



59.2" 

 0.4 



59.0 



59-4 

 3-3 

 31 



59.2 



2-3 



0.5 

 2.0 



III. 





Mean. 



59.10- 

 0.55 



59.00 



59.40 

 3-35 

 3-15 



59-30 

 2.35 

 0.5 



1.9 



Comparison of Chronometer and Clock. 



Chronometer 



Before 

 After 



II" 

 15 



Clock. 

 i6'»40"' 11.87' 

 18 44 32.13 



Mean Error, and Rate of Sidereal Clock. 

 Mean of 7 * ' Mean error corresponding. 



i6»'2i'» 48.25' 



Mean rate. 

 — 0.16 



Comparison 13th to ditto 14th + 0.38. 

 Chronometer fast i" 20.24". 



July 15th. The third, fourth, and last rockets disappeared 

 without any explosion. In the third column something like 

 an explosion was noted at the beginning of the ascent of the 

 third rocket, but no dependance can be placed on it. 



Comparison of Chronometer and Clock. 



Chronometer. 



Before 

 After 



91*24" 

 II 10 



Clock. 

 i6'>5^'° 9.80' 

 18 43 27.04 



Mean of 6 • " 

 iGh o 



Mean Error, and Rate of Sidereal Clock. 



Mean error corresponding. 

 47.92- 



Mean rate. 

 — 0.30 



Comparison 14th to ditto 15th + 0.47 

 Chronometer fast i" 20.71s. 



