Yerkes LionYerkes Lion YERKES OBSERVATORY
The University of Chicago

373 W. Geneva St, Williams Bay WI 53191 (Latitude 42 34.2, Longitude -88 33.4)

The Yerkes Obervatory Photographic Plates

Characteristics of some of the telescopes used to obtain plates in the Yerkes Archive

Telescope Code Aperture Focal length  (inch) Plate Scale ("/mm) Dates Notes
(cm) (inch)
YERKES OBSERVATORY TELESCOPES
Yerkes 40-in refractor Y40 100 40 744 10.65 1900-1997  
Yerkes 24-in refractor Y24 61 24 93 87 1900-1955  
Yerkes Bruce Photographic YB10 25 10 50 160 1905-1950  
Yerkes Bruce Photographic YB6A
YB6B
16
14.5
6.25
5.7
31
32
263
253
1905
1905-1935
Original 6-inch lens
New UV transmitting
Yerkes Ross Photographic YR3-v YR3-p 7.6 3   390   Dual pg and pv cameras Assume same as MD3
Yerkes f/4 Schmidt YS 18          
Yerkes Ross-Fecker YR5-M  YR5-F 12.7 5 35 230 1931- Used at Mt. Wilson
Used at Flagstaff
Yerkes 41-inch reflector Y41 100 40 325 25 1970-1997  
Kenwood 12-inch refractor Y12 30 12   40 1893-1940  
 
YERKES SMALL CAMERA LENSES
Clark lens YC 8.5 3.4 20   1897-1903  
Hale lantern lens YH 4.0 1.6 4.9 1290 1897- 1903ApJ....17...77B
Voightlander 6-inch lens YV6 16 6.25 31 260 1898 Same as YB6A?
Voightlander 4-inch ;lens YV4 10 4 7.9   1898  
Mr. Swasey's wide angle           1899  
Brashear 4.5-inch lens   11 4.25        
Zeiss lens (= "Unar" lens?)           1903-1906  
Darlot lens           1904  
H.C.O. 4-inch Cooke lens   10 4     1910  
Brashear 1-inch lens   2.5 1     1910  
Bausch & Lomb Tessar lens   5.7 2.25   820 1910  
Stormer cinematograph lens           1916  
Voightlander Euryscope lens           1918 From Dr. Isham
Mr. Stone's 6-in Voightlander   15 6     1919  
Dr. Mees' 4-inch aeroplane lens   10 4 10 800 1920 Note says "see book 5"
 
1910 COMET HALLEY EXPEDITION TO HAWAII
6-inch Brashear (32-in f.l.) Y-HB6 34 6 32 255 1910  
2.25-inch Tessar (9.875-in f.l.) Y-HT2 5.7 2.25 9.875 820 1910  
 
McDONALD OBSERVATORY TELESCOPES
McDonald 82-inch prime focus MD82p 208 82     1939-  
McDonald 82-inch Cass focus MD82c 208 82     1939-  
McDonald 10-inch Cook MD10 25 10     1950 - 1970  
McDonald 5-inch Ross-Fecker MD5 12.5 5 35 230 1950 - 1957 Same as YR5?
McDonald 3-inch Ross MD3 7.6 3   390 1937 - 1938 Same as YR3
McDonald UV camera MD5.7 14.5 5.7   254 1937 - Same as YB6B
 
OTHER OBSERVATORIES
Mt. Wilson 60-inch MW60 152 60 299 27 1911  
Mt. Wilson 10-inch Cooke MW10 26 10.25   115 1950 - 1965  
Mt. Wilson 5-inch Ross MW5 12.5 5       Perhaps same as YR5
U. Illinois Ross-Fecker I-RF4 10 4 28 290 1939 - 1980  
Dearborn Obs. Red Camera DO10 26 10.5 52.5 155 1937-1947 630 A/mm prism
Lick 6-inch Willard lens LW6 15 6 31 260   Copies of Lick plates