PART I. 



Containing Astronomical Observations and Calculations made on the 

 Expedition for exploring' the wafers nf the Mississippi and coun- 

 try west of it, under the command of Major S. H. Long, of the 

 United States'' Topographical Engineers, in 1819 and 1820. By 

 J. D. Graham, Lieut. U. S. Artillery. 



Pittsburgh, Pennsylvania, May 1st, 1819. 

 Magnetic dip, as ascertained by several observations, 78^ 12'. 



Observations made at Ship pin gsport, Kentucky. 



May 20, 1819. 

 May 21, 1819, 



Equal altitudes of Sun to find error of Time-piece. 



May 21, 1819. 

 May 22, 1819. 



Variation of time-piece between noon of the 21st and that of the 22d 

 was 9" losing. Set the chronometer on the morning of the 23d to 

 mean time. 



Camp on the Mississippi River, near the mouth of the Merameg. 

 June 8th, 1819. 



June 8th, 1819. 



B 



