376 ASTRONOMICAL OBSERVATORIES. 



employed, 2 ig iiiclies ; magnifying power ordinarily employed, 50 diam- 

 eters. 



(c) Equatorial instruments : One made by Henry Fitz, of New York ; 

 aperture of objective, 4:^^ inclies ; magnifying powers of eye-pieces, 30 

 to 240 ; one made by Meez & Son, of Munich ; aperture of objective, 

 7 1 inclies 5 magnifying jiowers of eye-pieces, SO to 1018. This instru- 

 ment is furnished with a micrometer, reflecting prisms and sunshades. 

 It is driven by clock-work. The hour circle is 10 inches in diameter. 

 It is graduated on silver to single minutes, and read by two verniers 

 to 4 seconds of time. The declination circle is 15 inches in diameter. 

 It is graduated on silver to 10 minutes, and read by two verniers to 10 

 seconds of arc. The finder was made by Alvan Clark «& Sons, of 

 Cambridgoport, Mass. It has an aperture of 1|- inches and a focal length 

 of 17 J inches. 



{g) Cloclcs: One mean time; maker, Eiggs, of Philadelphia: one 

 sidereal ; makers, Gregg & Rupp, of New York. 



(i) 2UsceUancous : The instrumental equipment includes also a sextant 

 made by E. «& G. W. Blunt, of New York ; the arc is graduated on 

 silver, and reads by a vernier and miscroscope to 10 seconds. An alt- 

 azimuth instrument, made by E. & G. W. Blunt ; it has an aperture 

 of 2^ inches ; the circles are 12 inches in diameter and graduated to 10 

 minutes ; the horizontal circle has four verniers with microscopes and 

 the vertical circle two, and each reads to 10 seconds. A Transit theodo- 

 lite, made by Gregg & Rupp, of New York. 



Columbus, Ohio. 



Private Observatory. 



Longitude from Washington, 23'" 54* W. 

 Latitude, 40° 0' 1.5" N. 



Authority for longitude and latitude: U. S. Coast Survej' for State- 

 House dome, 2 miles distant. 

 Director: R. W. McFarland. 

 Instruments : 

 (c) Equatorial instrument: Makers, Alvan Clark & Sons; aper- 

 ture of objective, 5 inches. 

 (<5f) Clocli: Mean time ; makers, Parkinson & Frodsham. 



Crete, Nebraska. 



Boswell Ohscrratory of Thane College. 



Longitude from Washington, . 



Latitude, . 



Director : — . 



