| Locality. | Aperture in Inches. | Focal Length in Feet. | Constructor. | Remarks. |
| Birr Castle, Parsonstown, Ireland | 72 | 54 | Third Earl of Rosse, 1845 | Newtonian. |
| Melbourne Observatory | 48 | 28 | T. Grubb, 1870 | Cassegrain. |
| Birr Castle | 36 | -- | Third Earl of Rosse, 1839 | Newtonian. Remounted equatoreally 1876. |
| Royal Observatory Greenwich | 24 | 20 | William Lassell, 1846 | Newtonian. Presented by the Missess Lassell to the Royal Observatory |
B. Silvered Glass Mirrors. |
| Ealing, near London | 60 | 27 | A. A. Common, 1891 | Newtonian. |
| Yerkes Observatory | 60 | 25 | G. W. Richey, 1902 | Can be employed at choice as a Coudé or a Cassegrain. |
| National Observatory, Paris | 48 | -- | Martin, 1875 | Newtonian. Remodelled for spectrographic work by Deslandres in 1892 |
| Meudon Observatory | 39 | 9·7 | | |
| Lick Observatory | 36 | 17·5 | Calver, 1879 | Mounted by Common at Ealing in 1879. Sold by him to Crossley, 1885. Presented by Crossley to the Lick Observatory, 1895. |
| Toulouse Observatory | 32·5 | 16·2 | Brothers Henry | |
| Marseilles Observatory | 31·5 | -- | Foucault | |
| Royal Observatory, Greenwich | 30 | -- | | Cassegrain. Mounted as a counterpoise to the Thompson equatoreal. |
| Westgate-on-Sea | 30 | -- | Common, 1889 | The property of Sir Norman Lockyer. |
| Harvard College Observatory | 28 | -- | H. Draper, 1870 | Mounted for spectrographic work,1887. |
| Royal Observatory, Edinburgh | 24 | -- | T. Grubb, 1872 | |
| Daramona, Ireland | 24 | 10·5 | Sir H. Grubb, 1881 | Remounted 1891. Owned by Mr. W. E.Wilson. |
| Yerkes Observatory | 23·5 | 7·7 | Ritchey, 1901 | Ritchey, Cassegrain, with an equivalent focal length of 38 feet. |
| Harvard College Observatory | 20 | -- | Common, 1890 | |
| Crowborough, Sussex | 20 | 8·2 | Sir H. Grubb, 1885 | Mounted with a 7-inch refractor. |
2. Refractors. |
| Palais de l'Optique, Paris | 49·2 | 197 | Gautier, 1900 | Mounted as a siderostat in connection with a plane mirror 79 inches across. |
| Yerkes Observatory | 40 | 62 | Alvan G. Clark, 1897 | |
| Lick Observatory | 36 | 57·8 | A. Clark and Sons, 1888 | For photographic purposes a correcting lens is available, of 33 inches aperture, 47·8 feet focus. |
| Meudon Observatory | 32·5 | 55·2 | Henrys and Gautier, 1891 | Mounted with a photographic refractor of 24·4 inches aperture. |
| Astrophysical Observatory, Potsdam | 31·5 | 39·4 | Steinheil and Repsold, 1899 | Photographic. Mounted with a visual refractor 20 inches in aperture. |
| Bischoffsheim Observatory, Nice | 30·3 | 52·6 | Henrys and Gautier, 1886 | Visual. Mounted on Mont Gros, 1,100 feet above sea level. |
| Imperial Observatory, Pulkowa | 30 | 42 | A. Clark and Sons, 1885 | Visual. Mounted by Repshold. |
| National Observatory, Paris | 28·9 | -- | Martin | |
| Royal Observatory, Greenwich | 28 | 28 | Sir H. Grubb, 1894 | Visual and photographic. Mounted by Ransome and Simms. |
| University Observatory, Vienna | 27 | 34 | Sir H. Grubb, 1881 | Visual. |
| Royal Observatory, Greenwich | 26 | 26 | Sir H. Grubb, 1897 | The Thompson photographic equatoreal. |
| Naval Observatory, Washington | 26 | 29 | A. Clark and Sons, 1873 | |
| Leander McCormick Observatory, Virginia | 26 | 32·5 | A. Clark and Sons, 1881 | |
| Cambridge University Observatory | 25 | -- | T. Cooke and Sons. 1870 | Presented to the University in 1889 by Mr. R. S. Newall. |
| Meudon Observatory | 24·4 | 52·2 | Henrys and Gautier, 1891 | Photographic. Mounted with a visual 32·5-inch refractor. |
| Harvard College Observatory | 24 | 11·3 | A. Clark and Sons, 1893 | Photographic doublet. The gift of Miss Bruce. Transfered in 1896 to Arequipa, Peru. |
| Royal Observatory, Cape of Good Hope | 24 | 22·6 | Sir H. Grubb, 1898 | Photographic. The gift of Mr. McClean. Mounted with an 18-inch visual refractor. |
| Lowell Observatory, Flagstaff, Arizona | 24 | 31 | Alvan G. Clark, 1896 | Visual. First mounted near the city of Mexico. Installed at Flagstaff, 1897. |
| National Observatory, Paris | 23·6 | 59 | Henrys and Gautier, 1891 | Visual and photographic. Mounted as an equatoreal Coudé. |
| Halsted Observatory, Princeton, N.J. | 23 | 32 | A. Clark and Sons, 1883 | |
| City Observatory, Edinburgh | 22 | 30 | -- | Mounted as a visual equatoreal on the Calton Hill, 1898. |
| Etna Observatory | 21·8 | -- | Merz, 1897 | |
| Buckingham Observatory | 21·2 | -- | Buckingham and Wragge | |
| Porro Observatory, Turin | 20·5 | -- | Porro | |
| Chamberlin Observatory, Colorado | 20 | 28 | Alvan G. Clark and Saegmüller, 1894 | Visual. Fitted with a reversible crown lens for photography. |
| Manila Observatory | 20 | -- | Merz and Saegmüller, 1894 | Visual. Provided with a photographic correcting lens. |
| Strasburg Observatory | 19·2 | 23 | Merz and Repsold, 1880 | |
| Brera Observatory, Milan | 19·1 | 23 | Merz and Repsold | |
| Dearborn Observatory, Illinois | 18·5 | 27 | A. Clark and Sons, 1862 | Mounted 1864 |
| National Observatory, La Plata | 18·1 | 29·5 | Henrys and Gautier, 1890 | Coudé Mount. Visual. |
| Lowell Observatory, Flagstaff, Arizona | 18 | 26·3 | Brashear, 1894 | Mounted with a 12-inch Clark refractor as counterpoise. |
| Van der Zee Observatory, Buffalo, N.Y. | 18 | -- | Fitz | Dismounted. |
| Bischoffsheim Observatory, Nice | 16·5 | 26·2 | Henrys and Gautier, 1889 | Coudé Mount. Visual. |
| University Observatory, Vienna | 16·5 | 29·5 | Henrys and Gautier, 1890 | Coudé Mount. Visual. |
| Jesuit Observatory, Zi-ka-Wei | 16·5 | 22·5 | Henrys and Gautier, 1897 | Photographic. Mounted with a visual refractor of equal aperture. |
| Goodsell Observatory, Northfield, Minnesota | 16·2 | -- | Brashear, 1891 | |
| Warner Observatory, Rochester, N.Y. | 16 | 22 | A. Clark and Sons, 1891 | |
| Grand-Ducal Observatory, Königsstuhl, Heidelberg | 16 | 6·6 | Brashear and Grubb, 1900 | A twin photographic doublet. The gift of Miss Bruce. Mounted with a visual 10-inch refractor by Pauly. |
| Meudon Observatory | 15·7 | 5·3 | | |
| Washburn Observatory, Wisconsin | 15·6 | 20·3 | A. Clark and Sons, 1879 | |
| Teramo Observatory, Italy | 15·5 | -- | T. Cooke and Sons, 1885 | Formerly the property of Mr. Wigglesworth. |
| Royal Observatory, Edinburgh | 15·1 | -- | T. Grubb, 1872 | Presented by Lord Crawford. |
| Madrid Observatory | 15 | - | Merz | |
| Tulse Hill Observatory | 15 | 15 | Sir H. Grubb, 1870 | Lent by the Royal Society to Sir William Huggins. Mounted with an 18-inch Cassegrain reflector. |
| National Observatory, Paris | 15 | 29 | Lerebours | |
| Harvard College Observatory | 15 | 22 | Merz, 1847 | |
| National Observatory, Rio de Janeiro | 15 | -- | | |
| Tacubaya Observatory, Mexico | 15 | 15 | Sir H. Grubb, 1880 | |
| Stonyhurst College Observatory | 15 | 15 | Sir H. Grubb, 1893 | |
| Brera Observatory, Milan | 15 | -- | | |
| University of Mississippi | 15 | 15 | Sir H. Grubb, 1893 | Visual. Mounted with a photographic 9-inch refractor. |
| Imperial Observatory, Pulkowa | 15 | 22·5 | Merz and Mahler, 1840 | |
| Maidenhead Observatory | 15 | -- | Sir H. Grubb, 1893 | The property of Mr. Dunn. Mounted with a twin photographic refractor. |
| Odessa Observatory | 14·9 | -- | Merz, 1881 | |
| Bischoffsheim Observatory, Nice | 14·9 | 23 | Henrys and Gautier | |
| Brussels Observatory | 14·9 | 20 | Merz and Cooke, 1877 | |
| Observatory of Bordeaux | 14·9 | 22·4 | Merz and Gautier, 1880 | |
| Observatory of Lisbon | 14·9 | -- | Merz and Mahler | |