A. D. Bache on the injlu 



of the Moon, 6fC. 



Influence of the moovUs changes of declination on the horizontal force. 

 The method of investioration is precisely the same as thai 





s d 



One day before tlie'greate 





+0-8- 1 









OnednyaLr " •< 





E; |— - 



Two days after " 





On the day of the moon's 



rossing the equator, 



_j.^ ! j P/obable error of any 



One (lay befi.re the greate 











Onedayakr " " 





vir-'- 



Two days after " " 



" 



i probable that the gn 



Takir 



time of the maximum north declination an increase of horizontal 

 force of I'l scale division (or 000040 parts of the horizontal 

 force); at the time of the moon's crossing the equator the force 

 is decreased 1-2 scale divisions (or O'OOOOM parts of the horizon- 

 tal force). The horizontal force also appears decreased about 

 the time of the moon's greatest north declination, the amount is 

 about half that of the other two cases and is somewhat doubtful, 

 by an apparently excessive value on the preceding day. 



According to Broun there is at Makerstoun a maximum hori- 

 zontal force at the time of the moon's greatest north and soutb 

 declination with a minimum force at the time of her crossing the 

 equator; in two cases, therefore, viz: for north declination and 

 ) declination the Makerstoun and Philadelphia results agree, 



jvhile i 



third case they disagree or remain doubtful. Kreil s 

 results, from the Prague observations, do not appear to me suffi- 

 ciently decisive and regular to admit of comparison. 



Influence of the moon's variation in distance on the horizontal force. 



By a similar process of reduction as that followed in the pre- 

 ceding investigation we find 



The probable error of any one result is about the same as 

 the preceding results (tables XI. and XII). The results for ^ 



