MEMOIRS 
OF THE 
AMERICAN ACADEMY. 
I. 
An account of the Magnetic Observations made at the Observatory 
of Harvard University, Cambridge. 
BY JOSEPH LOVERING, 
HOLLIS PROFESSOR OF MATHEMATICS AND NATURAL PHILOSOPHY, 
AND 
W. CRANCH BOND, 
ASTRONOMICAL OBSERVER TO THE COLLEGE.” 
Communicated by Joseph Lovering, A. M. 
Tue object of this communication is to give some information in 
regard to the nature and progress of the series of magnetic obser- 
vations which has been instituted at the Observatory of Harvard 
University in codperation with the plan of the Royal Society, as 
* The authors of this paper desire it to be understood that Professor Ben- 
jamin Peirce has rendered great assistance in conducting the observations on 
Term and other days, and in devising simple methods of reduction. The em- 
pirical curves which are mentioned in this paper and which were calculated 
at a great cost of time and labor are the voluntary contribution of this gen- 
tleman to the objects of the Observatory. 
1 
