. Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20 : by order of the Hon. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party. Indians of North America; Discoveries in geography; Indians of North America. Astronomical ana Meteorological Records^ &?c. xiii Equal altitudes of Sim to find error of Time-piece at noon. July 18, 1819. Time from Noon, A. M. 3" 13' 111" 3 11 50 3 10 29 Time from Noon, P. Error of Time- piece. 2'
. Account of an expedition from Pittsburgh to the Rocky Mountains, performed in the years 1819 and '20 : by order of the Hon. Calhoun, sec'y of war: under the command of Major Stephen H. Long. From the notes of Major Long, Mr. T. Say, and other gentlemen of the exploring party. Indians of North America; Discoveries in geography; Indians of North America. Astronomical ana Meteorological Records^ &?c. xiii Equal altitudes of Sim to find error of Time-piece at noon. July 18, 1819. Time from Noon, A. M. 3" 13' 111" 3 11 50 3 10 29 Time from Noon, P. Error of Time- piece. 2' 58" slow. Mean time. Latitude of Franklin by observation of July 16 Do. do. do. 17 Do. do. do. 18 Do. do. by mean of three observations 38 57 09 N. 38° 56' 57" N. 38 56 45 N. 38 57 46 N. Observations at Franklin to ascertain the magnetic variation. July 18, 1819. Magnetic azimuth of sun's centre, A. M. Magnetic azimuth of sun's centre, same altitude Magnetic variation deduced ° 20'E.* S. 87 50 W. 11 42 E. Rate of Time-piece, (chronometer bij Tobias 8^ Levitt,) at Franklin. Daily losing'. July 16, 1819. July 17,1819. July 18, 1819. j Do. do. Slow for mean time Do. do. 1'41" 17' 2 20 00 2 58 00 38" 43'" 38 00 Data for the calculation of the Longitude of Franklin. 1st. July 16, 1819. At 8" 08' 35i" A. M. civil account per chro- nometer, the distance of the nearest limbs of the sun and moon was observed to be 62° 23' U", the latitude by observation being 38° 57' 09" N., longitude estimated at 6" 10' W. of Greenwich to find the true longitude. Longitude deduced, 6'» 11' 43" or 92° 55' 45" W. of Greenwich. 2d. At 8'' 15' 52" A. M. per chronometer, the distance of the near- est limbs of the sun and moon was observed to be 62° 20' 52^" on the 16th of July to find the longitude. Longitude deduced, 6" 11' 58^" or 92° 59' 37" W. of Greenwich. 3d. July 17, 1819. At %^ 29' 04i" A. M.
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