262 C. C. Hutchins — New Declination Instrument. 



lifted from the cradle to the supports A-B and the circle 

 rotated until the eyepiece wire marks the mean point of rest. 

 The circle is now read, and a pointing being made upon the 

 meridian mark, the change in the circle reading is the declina- 

 tion sought. The declination is rarely wanted closer than the 

 nearest minute, in fact considering the rapidity with which it 

 changes is not obtainable to less than that amount, and experi- 

 ence has shown that an apparatus of the above dimensions is 

 needlessly large for that degree of accuracy. 



A telescope of four inches length would doubtless do as 

 well, and thereby the whole would become very compact and 

 portable. 



Bowdoin College, June 14, 1909. 



