# Telescopes ## expand\_more The Harvard College Observatory (HCO) established and operated telescopes around the world to create astronomical glass plate photographs. Many of these telescopes—known as *astrographs*—were specially built for photographing the night sky. Others were standard telescopes that were later modified to capture images on glass plates. Over the years, telescope naming practices at HCO have varied, and the names can sometimes be confusing or inconsistent. This page aims to clarify and document the telescopes and instruments historically owned by the Harvard College Observatory that were used to produce the photographic plates now preserved in the Plate Stacks collection. **Please note:** This is not a comprehensive list of every instrument HCO has owned. It also does not include modern telescopes currently in use by the Center for Astrophysics | Harvard & Smithsonian, the Harvard College Observatory, or the Smithsonian Astrophysical Observatory. To explore current research instruments, visit [the main CfA webstite](https://cfa.harvard.edu/facilities-technology/telescopes-instruments). Each historical telescope featured here is associated with a specific [series](/plate-series) designation, which was used to label and identify the glass plate photographs it produced. ## Telescopes by Series Open all sections Close all sections ### A Series: The 24 inch Bruce Doublet expand\_more The 24-inch Bruce Doublet telescope has a 135 in focal length. It created the largest plates in the collection, measuring 14 x 17 inches, as well as some 8 x 10-inch plates. The telescope is named after Catherine Wolfe Bruce, who donated the funds to build the telescope. It was installed in Cambridge from 1893 to 1895 and created plates [A00001](https://starglass.cfa.harvard.edu/plate/a00001) to [A01730](https://starglass.cfa.harvard.edu/plate/a01730). The telescope was moved to Harvard's Boyden Station in Arequipa, Peru in 1896 and created plates [A01731](https://starglass.cfa.harvard.edu/plate/a01731) to [A14110](https://starglass.cfa.harvard.edu/plate/a14110). The third image shows the Boyden Station in 1897 with the Bruce building in the center, and the fourth image shows the interior of the Bruce building. The next two images from 2009 (courtesy of Javier Ramirez, Director of the Planetarium & Observatory Lima, Peru) show that the Bruce building has been converted to a chapel. The final two images show the telescope after it was moved in 1929 to the new Boyden Station in Bloemfontein, South Africa. The last image (as well as the third image) appears in Harvard College Observatory: The First Century, 1946. Use of the Bruce Doublet at Boyden Observatory was discontinued in 1950, and it was replaced by the ADH telescope. In South Africa, it created plates [A14111 ](https://starglass.cfa.harvard.edu/plate/a14111)to [A27504](https://starglass.cfa.harvard.edu/plate/a27504). --- ![A black and White image of a building covered in ivy with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/Aseries2.jpg?itok=KHBt0sWx) --- ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/Aseries3.jpg?itok=3gj4chYZ) --- ![A black and White image of several buildings on a mountain.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/Aseries7.jpg?itok=wgQPtRwV) The Boyden Station Observatory in Ariquipia, Peru. The Bruce telescope building is the white stone masonry building with the white dome in the center. The volcano, Mount Misti, is in the background. --- ![A black and White image of a telescope poking out of the roof of a dome.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/Aseries9.jpg?itok=CYQJNogr) --- ![a image of a small rectangular building in the shade of 2 big trees with a propane tank out front](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/aseries4.jpg?itok=FcA57HKp) The original Bruce telescope building was converted into a chapel, and the dome was removed. This is as it appeared in 2009, photo courtesy of Javier Ramirez, Director of the Planetarium & Observatory, Lima, Peru. --- ![the inside of a church](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/aseries5.jpg?itok=Op4cWlwK) The interior of the currently converted Bruce building in Ariquipa, Peru. This is as it appeared in 2009, photo courtesy of Javier Ramirez, Director of the Planetarium & Observatory, Lima, Peru. --- ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/aseries6.jpg?itok=6gUNW5Kh) The Bruce telescope installed in the Boyden Observatory in Bloemfontein, South Africa. --- ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/Aseries8.jpg?itok=4wI6VKd0) The Bruce telescope installed in the Boyden Observatory in Bloemfontein, South Africa. ### ADH Series: Baker-Schmidt & Armagh-Dunsink-Harvard expand\_more ADH Series: 32-36 inch Baker-Schmidt and 10.5 inch round Armagh-Dunsink-Harvard This telescope was built in cooperation with the [Armagh Observatory](https://armagh.space/) in Northern Ireland, UK, the [Dunsink Observatory](https://www.dunsink.dias.ie/) in Dublin, Ireland, and the Harvard College Observatory. It was put into service at the Boyden Observatory in Bloemfontein, South Africa, in 1950, using the mount from the Bruce telescope. The first picture is from Bloemfontein, South Africa, probably in the 1950's. On the left is John S. Paraskevopoulos, and on the right is Bart Bok. All remaining pictures are provided courtesy of Dawie van Jaarsveldt. The next four images were taken by Dr. Gordon Thompson in 1955. The last three images appear in [The Boyden Observatory by A.D. Andrews, Irish Astronomical Journal, 1998, 25(2), 129,](http://articles.adsabs.harvard.edu//full/1998IrAJ...25..129A/0000129.000.html) which contains much additional historical material on the Boyden Observatory. According to Dr. Butler of Armagh Observatory, the optical parts of the telescope were at Dunsink in 1995. --- ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries2.jpg?itok=xunLeuUO) --- ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries6.jpg?itok=m6wwMboK) --- ![A black and White image of a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries7.jpg?itok=Mkyia04U) --- ![a image of a man peering into a telescope mirror](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries3.jpg?itok=MnUm0Myt) --- ![A black and White image of a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries9.jpg?itok=h4ks7f7n) --- ![A black and White image of a telescope with a garage door in the background.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries8.jpg?itok=Kba2OOob) --- ![A black and White image of a telescope outside a building.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries4.jpg?itok=xYD05mYF) --- ![A large blue telescope pointed at the sky.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/adhseries5.jpg?itok=s-5bY5Z2) ### AM Series: 1 inch and 1.5 inch Cooke Lens expand\_more This photograph appears in A Manual for Celestial Photography by Edward Skinner King, 1931, page 50. The telescope was at Arequipa, Peru from 1899 to 1923; Chuquicamata, Chile in the summer of 1923-24; San Jose, Peru in the summer of 1924-25; and at Bloemfontein, South Africa from 1935 to 1954. --- ![a news paper clipping of a boxy telescope](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/amseries1.jpg?itok=X7UHubCd) ### B Series: 8 inch Bache Doublet, Voigtlander, reworked by Clark expand\_more This telescope was used at Solon I. Bailey's temporary station on Mount Harvard near Chosica, Peru where the first photometric measurements of Southern Stars were made in May, 1890. The telescope was also used in Cambridge; Willows, California; Arequipa, Peru; and Bloemfontein, South Africa. --- ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/bseries1.jpg?itok=wBbVkF0_) ### C Series: 11 inch Draper Refractor expand\_more This photograph appears in A Manual for Celestial Photography by Edward Skinner King, 1931, page 7. ![a news paper clipping of a telescope in a wooden dome](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/cseries1.jpg?itok=pjwM4Pld) ### Damons South Blue Red and Yellow expand\_more [The Patrick Moore Collection photograph of the Damons installed at Bloemfontein, South Africa.](http://www.patrickmoorecollection.com/viewSlide.php?id=7007&gallerypage=1&category=134&search=harvard) ![a image of 3 telescopes on a concrete base aimed at the sky.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/ax071.jpg?itok=20pTRTEU) ### EE Series: 4 inch Voightlander Lens expand\_more This photograph appears in A Manual for Celestial Photography by Edward Skinner King, 1931, page 51. ![a news paper clipping of a small telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/eeseries1.jpg?itok=a6gOynJO) ### H Series: 24 inch Clark Reflector expand\_more The left picture from The Anonymous Gift of 1902 by Edward Pickering, April 26, 1906 was provided courtesy of John Briggs. The barrel of the this telescope is now the property of the Springfield Telescope Makers club and was on display at the 2010 Stellafane convention. ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/hseries3_1.jpg?itok=rKkTst_-) ![a image of a trailer and a camper behind a disassembled blue telescope](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/hseries1.jpg?itok=9ZQOsGYu) ![a image of a disassembled blue telescope](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/hseries2.jpg?itok=AkOoEX6Y) ### I Series: 8 inch Draper Doublet, Voigtlander Reworked by Clark expand\_more This telescope was used primarily at Cambridge from 1889 to 1946. The second image appears in Harvard College Observatory: The First Century, 1946. In 1947 the telescope was moved to Poland. ![A black and White image of a building with a man standing next to the telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/iseries1.jpg?itok=J22v1a-S) ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/iseries2.jpg?itok=g7VM3ZQs) ### IR Series: 8 inch Ross Lundin expand\_more This telescope was in operation at Oak Ridge Observatory from 1934 to 1976. The second image appears in Harvard College Observatory: The First Century, 1946. ![A black and White image of a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/irseries1.jpg?itok=-efU4-v5) ![A black and White image of a building with 2 woman fixing a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/irseries2.jpg?itok=9V8mqO8d) ### J Series: 24-33 in Jewett Schmidt expand\_more This telescope was used at Oak Ridge from 1942 to 1957. The third image shows the plateloader mechanism. the These images Harvard College Observatory: The First Century, 1946. ![A black and White image of a building with a telescope poking out of the side.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/jseries1.jpg?itok=6ateMp8y) ![A black and White image of the inside of a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/jseries2.jpg?itok=VM8eNpYh) ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/jseries3.jpg?itok=psrpuFnx) ### MA Series: 12 inch Metcalf Doublet expand\_more This telescope was first used at Rev. Metcalf's observatory in Taunton, Massachusetts from 1905 through at least 1913. It was moved to Cambridge in 1923 and to Oak Ridge Observatory in 1938. ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/maseries1.jpg?itok=ipzr7XUf) ### MC Series: 16 inch Metcalf Doublet expand\_more This telescope began operation in Cambridge in 1909 and was moved to Oak Ridge Observatory in 1932 where it was in use at least until 1992. With a limiting magnitude of 18, this telescope, in conjunction with the Bruce telescope in the Southern Hemisphere, was used to identify over 500,000 new galaxies by Dr. Shapley and his team. The last two images appear in Harvard College Observatory: The First Century, 1946. The third image shows the 16 inch Metcalf behind the patrol camera battery. The fourth image shows Henry A. Sawyer loading plates. ![A black and White image of a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mcseries1.jpg?itok=4tVSMFhb) ![A black and White image of a building with a man standing in a bag connected to a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mcseries3.jpg?itok=62Egy8JW) ![A black and White image of a building with a man standing in a bag connected to atelescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mcseries2.jpg?itok=oIxqrLFt) ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mcseries4.jpg?itok=P98atD5b) ### MF Series: 10 inch Metcalf Triplet expand\_more The first picture shows the telescope's final location in Bloemfontein, South Africa. The MF telescope is partly obscured by an unknown refractor with a conical tube. The telescope in the rear is probably the 13 inch Boyden Refractor. The next two pictures are provided courtesy of Dawie van Jaarsveldt. The second image of the telescope building was taken by Dr. Gordon Thompson in 1955. The third image was taken by A.D. Andrews in 1965-66 and appears in [The Boyden Observatory by A.D. Andrews, Irish Astronomical Journal, 1998, 25(2), 129](http://articles.adsabs.harvard.edu//full/1998IrAJ...25..129A/0000129.000.html) The Friends of Boyden web site has [a recent photograph of this telescope.](http://www.assabfn.co.za/friendsofboyden/boydenpictures/10inch_metcalf_closeup_large.jpg) ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mfseries2.jpg?itok=8si48CAt) ![A black and White image of a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mfseries3.jpg?itok=Pz8E9D4V) ![A black and White image of a building.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/mfseries4.jpg?itok=zxCoiDN6) ### S Series: 60 inch Common Reflector expand\_more ![A black and White image of a building with a telescope poking out of the side.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/sseries1.jpg?itok=jfs4EpO4) This picture from The Anonymous Gift of 1902 by Edward Pickering, April 26, 1906 was provided courtesy of John Briggs. The eyepiece is in a fixed position in the building on the left side of the picture. This telescope was sent to Bloemfontein in 1928 and became the "SB" series reflector. ### SB Series: 60-inch Rockefeller Reflector expand\_more ![A black and White image of a building with a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/sbseries3.jpg?itok=iELmaJPm) \[This telescope was installed in Bloemfontein, South Africa, in 1933. The telescope originally used a thin Common mirror from England and required a system of levers and counterweights to adjust the image quality prior to each exposure. The first two images come from Harvard College Observatory: The First Century, 1946. In front of the 60-inch Rockefeller Dome in the middle image, from left to right, are the A (later replaced with the ADH), X, and MF telescopes. The third image, provided courtesy of Dawie van Jaarsveldt, was taken by A.D. Andrews in 1965-6 and appears also in [The Boyden Observatory by A.D. Andrews, Irish Astronomical Journal, 1998, 25(2), 129](http://articles.adsabs.harvard.edu//full/1998IrAJ...25..129A/0000129.000.html) Recent photographs may be found on the [Friends of Boyden](http://www.assabfn.co.za/friendsofboyden/explore_60inch.htm) website. ![A black and White image of a building with a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/sbseries2.jpg?itok=t9GORay4) ![A black and White image of several buildings on a mountain.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/sbseries1.jpg?itok=rwpRIFlE) ### SH Series: 61-inch Wyeth Reflector expand\_more This telescope was installed at Oak Ridge Observatory in 1934. Like the 60-inch Rockefeller, this telescope originally used a Common mirror which was replaced with a Pyrex mirror in 1936. The images below come from Harvard College Observatory: The First Century, 1946. ![A black and White image of a building with a telescope.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/shseries2.jpg?itok=0S2sLbjw) ![A black and White image of a building](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/shseries1.jpg?itok=7TbLXXlU) ### X Series: 13 inch Boyden Refractor expand\_more This picture shows the telescope, also referred to as the 13-inch Clark at Bloemfontein, South Africa. The second image, provided courtesy of Dawie van Jaarsveldt, was taken by A.D. Andrews in 1965-6 and appears also in [The Boyden Observatory by A.D. Andrews, Irish Astronomical Journal, 1998, 25(2), 129](http://articles.adsabs.harvard.edu//full/1998IrAJ...25..129A/0000129.000.html) ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/xseries1.jpg?itok=mJDoKDNV) ![A black and White image of a building with a telescope poking out of the roof.](/sites/g/files/omnuum2761/files/styles/hwp_1_1__960x960_scale/public/2026-02/xseries2.jpg?itok=ylgwGFBf)