472 ASTRONOMICAL OBSERVATORIES 



Founded in 1750. IJere Wargentin made that long series of obser- 

 vatiou on Jupiter's satellites whicb resulted iu tbe first reliable tables 

 of eclipses of these satellites. 

 Instruments : 



(a) Meridian circle: Makers, Ertel '& Son; diameter of circles, 18 

 inches; divided too'; read by 4 microscopes to 1"; aperture of objective, 

 4§ inches (0.107 meters); magnifying power ordinarily employed, 124 

 diameters. 



{b) Meridiem transit instrument : Maker, A. RErsoLD ; aperture, 2i 

 inches, 



(c) Equatorial instrument : Maker, A. liEPSOLD; ai)erture of objective, 

 7 inches; maguifyiiig powers of eye-pieces, 114, 150, 190, 302, COO, 



(/) Chronogra^ths : Two. 



{{/) Clocl's: Mean time; makers, Molyneux & CorE ; sidereal; 

 makers, Kessels, Sweder. 



{h) Chronometer: Meantime; makers. Dent, LiNDEROTH. 



Stonyiiurst College (near Wiialley), England. 



Stonyhurst College Observatory. 



Longitude from Greenwich, 9"' 52.08s w 



Latitude, 53° bH' 40" N. 



Authority ibr longitude and latitude : Nauti(;al Almanac. 



Directors : Eev. A. Weld, S. J., F. II. A. S., 1838. 



Eev. S. J. Perry, S. J., F. E. A. S., 1800. 



Location: Four mik^s W. of Whalley, Lancasliire, England. 



Height above sea, 381 feet. Euilt in 1838 in the park of the Jesuit 

 College. 



Instruments : 



{a) Meridian circle: By Jones; 2 feet G inches; divided to 5'; micro- 

 scopes reading to 1"; aperture of object glass, 3 inches; power gen- 

 erally used, 56. 



(6) Transit instrument: xiperture of object glass, 2§ inches; power 

 generally used, 42; by Cary. 



((!) Equatorial instruments: One by Napier, Curry, Troughton 

 and SiMMS; aperture, 8 inches; powers from 30 to GOO or 700; one by 

 JoNES; aperture, 4 inches, {c') A Cassegrain rellcctor; aperture, 9^ 

 inches; two, Newtonian; aperture, 7 inches. 



(d) 8pectroseoi)cs : An automatic instrument by Urowntng, G prisms 

 of G0°, each used twice, with a half ])rism, making largest disper- 

 sion =30 prisms of G0°. A large star spectroscope by SniMS, 4 com- 

 pound i)risms by IIoffman. A large direct- vision spectroscope by 

 Browning. Two smaller instruments by Browning. 



(/) Chronograph: Small one by Breguet. 

 {g) Clods: Two sidereal, mercurial pendulums. 



