# Plate Series Plates are cataloged by plate series and plate number. Each series typically represents a single telescope although some series, notably the "mb" series consists of data from multiple telescopes. Telescopes were occasionally moved to other [observatories](http://dasch.rc.fas.harvard.edu/observatories.php) depending on observational goals. The following table represents all of the Harvard plate series currently in the database. The plate scale, if available, comes from the WCS fitting algorithm. Otherwise, the scale comes from archive records. The values provided here are not definitive for early "mc" plates before the objective was refigured, and for the multiple-telescope "mb" series. There are currently 88 series in the database. The primary source of this information comes from Martha Hazen's History of the Plate Series. To see this source information, click on the series name in the table below. Sort seriesId Series Aperture (m) Scale (arcsec/mm) Telescope 1 [a](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History01.jpg) 0.6 59.57 [24-inch Bruce Doublet](http://dasch.rc.fas.harvard.edu/telescopes.php#a_series) 37 [ab](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History02.jpg) 0.0635 590 2.5-inch Ross Portrait Lens 2 [ac](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History03.jpg) 0.038 606.4 1.5-inch Cooke Lenses 38 acmisc ac-b logbook. No plates. 39 [aco](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History04.jpg) 0.0254 611.3 1 in Cook Lens #832 Series renamed from ac-a 3 [adh](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History05.jpg) 0.76 68 [32-36 inch BakerSchmidt 10 1/2 inch round Armagh-Dunsink-Harvard](http://dasch.rc.fas.harvard.edu/telescopes.php#adh_series) 40 [ai](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History07.jpg) 0.038 1360 Patrol cameras 41 [ak](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History08.jpg) 0.038 614.5 1.5 in Cooke "Long Focus" 4 [al](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History09.jpg) 0.038 1200 Cooke Short Focus 5 [am](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History09.jpg) 0.038 610.8 [1-inch, 1.5-inch Cooke Lenses](http://dasch.rc.fas.harvard.edu/telescopes.php#am_series) 42 [an](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History10.jpg) 574 New Cooke Lens 43 [ax](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History11.jpg) 0.076 695.7 3 inch Ross-Tessar Lens 44 [ay](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History12.jpg) 0.066 694.2 2.6-inch Zeiss-Tessar 79 [ayroe](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History12.jpg) 0.152 Roe 6-inch 6 [b](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History13.jpg) 0.2 179.4 [8-inch Bache Doublet, Voigtlander, reworked by Clark](http://dasch.rc.fas.harvard.edu/telescopes.php#b_series) 45 [bc](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History14.jpg) 0.406 16-inch Boller & Chivens 46 [bi](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History15.jpg) 0.038 1446 1.5 inch Ross (short focus) 7 [bm](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History15.jpg) 0.075 384 3-inch Ross 47 [bo](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History16.jpg) 0.0635 800 2.5 inch Voigtlander (Little Bache or "Bachito") 8 [br](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History16.jpg) 0.2 204 8-inch Brashear Lens 9 [c](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History17.jpg) 0.3 84 [11-inch Draper Refractor](http://dasch.rc.fas.harvard.edu/telescopes.php#c_series) 48 [ca](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History17.jpg) 0.0635 596 2.5 inch Cooke Lens 10 [d](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History18.jpg) Positives 49 [darnor](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History19.jpg) 890 Darlot Lens North 50 [darsou](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History19.jpg) 890 Darlot Lens South 11 [dnb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History20.jpg) 0.042 577.3 Damons North Blue 12 [dnr](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History20.jpg) 0.042 579.7 Damons North Red 13 [dny](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History20.jpg) 0.042 576.1 Damons North Yellow 14 [dsb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History20.jpg) 0.042 574.5 [Damons South Blue](http://dasch.rc.fas.harvard.edu/telescopes.php#dsb_series) 15 [dsr](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History20.jpg) 0.042 579.7 [Damons South Red](http://dasch.rc.fas.harvard.edu/telescopes.php#dsr_series) 16 [dsy](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History20.jpg) 0.042 581.8 [Damons South Yellow](http://dasch.rc.fas.harvard.edu/telescopes.php#dsy_series) 51 [ee](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History21.jpg) 0.102 330 [4-inch Voightlander Lens](http://dasch.rc.fas.harvard.edu/telescopes.php#ee_series) 52 [er](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History22.jpg) 0.076 390 3-inch Elmer Ross 17 [fa](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History24.jpg) 0.038 1298 1.5-inch Ross-Xpress 18 [h](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History26.jpg) 0.6 59.6 [24-inch Clark Reflector](http://dasch.rc.fas.harvard.edu/telescopes.php#h_series) 53 hsl Henrietta Leavitt Logbooks. No plates. 19 [i](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History27.jpg) 0.2 163.3 [8-inch Draper Doublet, Voigtlander Reworked by Clark](http://dasch.rc.fas.harvard.edu/telescopes.php#i_series) 20 [ir](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History27.jpg) 0.2 164 [8-inch Ross Lundin](http://dasch.rc.fas.harvard.edu/telescopes.php#ir_series) 21 [j](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History28.jpg) 0.6 98 [24-33 in Jewett Schmidt](http://dasch.rc.fas.harvard.edu/telescopes.php#j_series) 54 [jdar](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History28.jpg) 0.076 560 3-inch Darlot (Series renamed from j) 86 [ka](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History29.jpg) 0.071 1200 2.8-inch Kodak Aero-Ektar 87 [kb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History30.jpg) 0.071 1200 2.8-inch Kodak Aero-Ektar 88 [kc](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History30.jpg) 0.127 650 K-19 Air Force Camera 89 [kd](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History30.jpg) 0.127 650 Air Force Camera 90 [ke](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History31.jpg) 0.071 1160 Eastman Aero-Ektar K-24 Lens on a K-19 Barrel 91 [kf](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History31.jpg) 0.071 1160 Eastman Aero-Ektar K-24 Lens on a K-19 Barrel 92 [kg](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History31.jpg) 0.071 1160 Eastman Aero-Ektar K-24 Lens on a K-19 Barrel Formerly KE 93 [kge](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History31.jpg) 0.071 1160 Eastman Aero-Ektar K-24 Lens on a K-19 Barrel Formerly KE 94 [kh](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History32.jpg) 0.071 1160 KE Camera with Installed Rough Focus 56 [m](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History35.jpg) 0.127 5-in Voightlander Transit Photometer 22 [ma](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History36.jpg) 0.3 93.7 [12-inch Metcalf Doublet](http://dasch.rc.fas.harvard.edu/telescopes.php#ma_series) 23 [mb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History37.jpg) 0.1 390 4-inch Cooke (1-327), 6-inch (328-1776) 3-inch Ross Lundin (2388-2722) 24 [mc](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History38.jpg) 0.4 97.9 [16-inch Metcalf Doublet (Refigured after 3500)](http://dasch.rc.fas.harvard.edu/telescopes.php#mc_series) 25 [md](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History39.jpg) 0.1 193 4-inch Cooke Lens 82 [me](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History39.jpg) 0.038 600 1.5-inch Cooke Lenses 26 [meteor](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History40.jpg) 0.3 1200 27 [mf](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History40.jpg) 0.25 167.3 [10-inch Metcalf Triplet](http://dasch.rc.fas.harvard.edu/telescopes.php#mf_series) 55 misc Logbook Only. Pages without plates. 57 [n](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History41.jpg) Transit Photometer 58 [nviews](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History41.jpg) Landscapes and views (Series renamed from n) 60 [o](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History43.jpg) Stellar 59 [oa](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History44.jpg) Stellar 61 [p](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History44.jpg) Eclipse Plates 81 [pz](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History47.jpg) 0.076 1553 3 inch Perkin-Zeiss Lens 64 [q](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History47.jpg) Emulsion and Lens Tests 62 [qa](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History47.jpg) Emulsion and Lens Tests 63 [qb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History47.jpg) Emulsion and Lens Tests 29 [r](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History48.jpg) 0.075 390 3-inch Ross Fecker 65 ra Prints of Neg. Post (?) Enlargements 30 [rb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History49.jpg) 0.075 395.5 3-inch Ross Fecker 31 [rh](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History50.jpg) 0.075 391.3 3-inch Ross Fecker 32 [rl](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History50.jpg) 0.1 290 4-inch Ross Lundin 66 [ro](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History51.jpg) 390 67 [rp](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History52.jpg) 68 [s](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History53.jpg) 1.52 26.3 [60 inch Common](http://dasch.rc.fas.harvard.edu/telescopes.php#s_series) 33 [sb](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History53.jpg) 1.5 26 [60-inch Rockefeller Reflector](http://dasch.rc.fas.harvard.edu/telescopes.php#sb_series) 34 [sh](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History54.jpg) 1.5 26 [61-inch Wyeth Reflector](http://dasch.rc.fas.harvard.edu/telescopes.php#sh_series) 77 [solar](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History52.jpg) Solar (Series Discarded) 69 [sp](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History55.jpg) Spectrum SH Plates 70 [sq](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History56.jpg) SB Spectrum Plates 71 [t](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History58.jpg) Sky Photometer 72 [vq](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History61.jpg) Heinrich VQ (Spectrograph) 74 [w](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History61.jpg) Slit Spectrograph 73 [wa](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History62.jpg) Cooke Lens #11366 (Western Association) 78 ww Heinrich Camera Lens 35 [x](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History64.jpg) 0.33 42.3 [13-inch Boyden Refractor](http://dasch.rc.fas.harvard.edu/telescopes.php#x_series) 75 [y](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History65.jpg) 0.203 8-inch Clark Doublet 76 [z](http://dasch.rc.fas.harvard.edu/HistoryOfPlateSeries/History65.jpg) 0.33 13-inch Boyden Refractor (spectrum plates)