Art. IX. — Total Eclipse of August 7 th, 1869, observed at 

 Mattoon, Illinois. 1 By Prof. G. W. Hough, A. M., 

 Director of the Dudley Observatory. 



[Read before the Albany Institute, October, 1869.] 



The station chosen by the Dudley Observatory party for 

 the observation of the total eclipse was at Mattoon, Illinois. 



The latitude and longitude of the station had previously 

 been determined by the United States coast survey : lati- 

 tude 39 deg., 29 min., 10.5 sec; longitude 45 min., 20.2 

 sec, west of Washington. 



Prof. J. H. C. Coffin, Superintendent of the Nautical 

 Almanac, kindly furnished us with the necessary data for 

 the observation of the phenomena. 



Observers. 



The corps of observers was composed of the following 

 persons : 



Prof. David Murray, Rutgers College, New Brunswick. 

 Telescope 3 in. achromatic, 3 ft. 4 in. focus, power 35. 



Mr. Lewis Swift, Marathon, N. Y. Telescope 4| in. 

 achromatic, power 36; 



Mr. J. C. House, Waterford, N. Y. Telescope 3^ in. 

 achromatic (direct vision), power 35. 



Mr. Thomas Simons, United States Attorney's office 

 New York city, Prof. L. F. M. Easterday, Hillsboro, 111. 

 Telescope transit, 2 in. objective, 2 ft. 6 in. focus, power 30. 



Prof. Twining, St. Louis, and Rev. Mr. Marshall, Indian- 

 apolis. Naked eye observations on stars visible. 



1 Read at the Salem meeting of the American Association. 

 [Trans, vi.~\ 23 



