REPORTS OF ASTRONOMICAL OBSERVATORIES. GG5 



{h) Chronometer: sidereal; maker, J. Fletcher, London. 



\i) Miscellaneous: Sextant; TROUGnTON & Simms, LondoiL 



Observatioiss during THE PAST YEAR (from September, LS70, 

 to September, 188U) : 



Besides regular trausit observations for time, by the director and 

 assistants, the instraments have beeu used by the senior class of the 

 Eensselaer Polytechnic Institute for i)ractice in astronomical observa- 

 tions. 



Work proposed for the coming year (1880-'81) : 



This is expected to be similar to the work of the past year. 



Washington, District of Columhia. 

 United States Xaval Observatory. 



Longitude from Greenwich, 5^' 8'" 12^09 W. 

 Latitude, 38^ 53' 38".8 ]S". 

 Directors: M. F. Maury, 1844; 



J. M. GiLLiss, 1861 ; 



C. H.Davis, lSo5; 



B. F. Sands, 18G7 ; 



Eear- Admiral John Eodgers, U. S. X., 1874. 

 Assistajits : 1. Prof. A. Hall, ") 



2. Prof, W. Harkness, I 



3. Prof. J. R. Eastman, } Professors, U. S. Navy. 



4. Prof. E. S. HoLDEN, | 



5. Prof. E. Frisby, \ 



6. Mr. A. E SKINNER, ^ p^,.,,,^,^^^,,^ ^4,,,.,,,,,, .^tron- 



7. Mr. H. W. PAUL, ^ ^^^^^^^.^ 



8. Mr. H. S. Pritchett, ) 



9. Mr. J. A. EOGERS, Temporarily employed in photographic 



experiments. 

 10. Mr. W. F. Gardner, Instrument-maker. 

 Created by the Navy Department in 1833. Transferred in 1843 to 

 University Square. In 1872 it came into possession of an equatorial ot 

 ALVAN Clark & Son, 32^ feet (9-.9) in focal length, and with an aper- 

 ture of 26 inches (0-.65) ; by means of which A. Hall discovered the 

 two satellites of Mars in 1877. 



Instru^eents : ^. ^ „ 



ia) Meridian circle: one; makers, PiSTOR & Martins; diameter of 

 circles, 43.40 inches; divided to 2'; read by 4 microscopes to 1; aper- 

 ture of objective, 8.52 inches; for observations of the ^^^^'"^^^ 

 ployed, 3 inches; magnifying power ordinarily employed, ^f^y^^^"^'''^' 

 (b) Meridian transit instruments: one made by Lrtel ^V ^of^ JJ^^^ " 

 tule 5.33 inches; magnifying powers, 85, 86, 106, 118, 162. {b') Light 



