REPORTS OF ASTRONOMICAL OBSERVATORIES. Gil 



spots ill the year 1S70 to be a inaxiiiiuin and in 1S7S a ininiinain. Tt will 

 be noted that these years are nearly those of maxinuun and uiininuiiu 

 observed auroras. 



WiLLiAMSTOWN, Mfififtach usetts. 



WnUamfitoicn Observatory. 



Loujiitude from Washington, 15™ ]8»,G E. 

 Latitude, 42° 42' 49" N." 

 Director : ? 



Ypsilanti, Washtcnaiv Count y, Michigan. 



State Normal School Observatory. 



Longitude from Washington, 20™ 10'' W. 

 Latitude, 42° 13' :^^. 



Authority for latitude and longitude: J. C. Watson. 

 Director : Lewis McLouTn, M. A. 



Instruments : 



(&) Meridian transit instrument : malvor, Gueley, Albany; aperture 

 li inches; magnifying power, 30 diameters. 



((') Equatorial instrument : maker, A. Clark, Cambridgeport, ^Nfass. ; 

 aperture of objective, 4 inches ; uuignifying powers of eye pieces, 45, 90, 

 144, 210. 



(d) Spectroscope : Browning, London, 2 prism. 



ill) Chronometer: sidereal; maker, Negus. 



(i) MisceUaneovs: The observatory building is completed. Xo syste- 

 matic work has been done. The building is small, and its equipment is 

 for instruction rather than investigation. The equatorial is quite good 

 — the one with which Professor Watson made his observations on the 

 supposed planet Yulcan. 



IL FOREIGN OBSERVATORIES. 



Aberdeen, Scotland. 



See Dun Echt. 



Abo, Eussia. 



Aho Observatory. 



Longitude from Greenwich, 1'^ 29™ 8«.2 E. 

 Latitude, COO 26' 5G".8N. 

 Director : — - — - ? 



