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Positive on glass

1890

Photograph of 'Praesepe' the beehive star cluster (M44), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 90 minutes on 13 February 1891 at his observatory & home at Crowborough, Sussex.

Photograph of 'Praesepe' the beehive star cluster (M44)

1891

Photograph of stars centred on the star Gamma Cassiopeia, taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 90 minutes on 17th January 1890 at his observatory & home at Maghull, near Liverpool.

Photograph of stars centred on the star Gamma Cassiopeia

1890

Photograph of the Ring Nebula in the constellation of Lyra (M57), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 60 minutes on 14th July 1887 at his observatory & home at Maghull, near Liverpool.

Photograph of the Ring Nebula in the constellation of Lyra (M57)

1887

Photograph of the Great Orion Nebula (M42), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 205 minutes on 4th February 1889 at his observatory & home at Maghull, near Liverpool.

Photograph of the Great Orion Nebula (M42)

1899

Photograph of the Double Star Cluster (H.VI.33&34) in the constellation of Perseus, taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 4 hours on 13th January 1890 at his observatory & home at Maghull, near Liverpool.

Photograph of the Double Star Cluster (H.VI.33&34) in the constellation of Perseus

1890

Positive on glass, enlarged at the National Observatory in Paris, of: New Nebula Isaac Roberts monocerotis (R.A.7h 0m, Dec S.10 degree 20') enlarged 3.4 times, scale 1mm to 24 seconds of arc, taken at Crowborough, Sussex, March 9th 1899, between sidereal time 7h1m and 9h 48m, with an exposure of 2h H7m.

Positive on glass

1899

Positive on glass, enlarged at the National Observatory in Paris, of: Nebula M.94 Canum Venaticorum (R.A. 12h 46m 13.1s, Dec. N.41 degrees 39.5') enlarged 6 times, scale 1mm to 14 seconds of arc, taken at Crowborough, Sussex, on May 21st, 1903, between sidereal time 15h. 15m and 16h, 15m with an exposure of one hour

Positive on glass

1903

Transparency, 10"x8", showing double open cluster in Perseus. N.G.C. 869 and 884, R.A.2h 14m. Dec.+56 degrees 40'. Isaac Roberts, Crowborough 1895, October 12. 20-inch Reflector, exposure 1h.30m.

Transparency, 10"x8", showing double open cluster in Perseus. N.G.C. 869 and 884

1895

Photograph of stars in the constellation of Cygnus, taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 60 minutes on 14th August 1887 at his observatory & home at Maghull, near Liverpool.

Photograph of stars in the constellation of Cygnus

1887

Photograph of twin galaxies (M82 & 82) in the constellation of Ursa Major, taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 3 1/2 hours on 31st March 1889 at his observatory & home at Maghull, near Liverpool.

Photograph of twin galaxies (M82 & 82) in the constellation of Ursa Major

1889

Photograph of the Andromeda Galaxy (M31), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 4 hours on 29th December 1888 at his observatory & home at Maghull, near Liverpool.

Photograph of the Andromeda Galaxy (M31)

1888

Photograph of the Whirlpool Galaxy (M51), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 4 hours on 29th April 1889 at his observatory & home at Maghull, near Liverpool.

Photograph of Whirlpool Galaxy (M51), taken by Isaac Roberts, 1889

1889

Positive on glass, enlarged at the National Observatory in Paris, of: Nebula, M.101 Ursae Majoris (R.A. 13h.59m.39s. Dec N. 54[o] 59 8') enlarged 6 times, scale 1mm to 14 seconds of arc taken at Crowborough, Sussex, 28th May, 1900 between sidereal time 14hr 36m and 17h 21m, with an exposure of 2h, 45m

Positive on glass

1900

Positive on glass, enlarged at the National Observatory in Paris, of: Spiral nebula M.51 Andromedae (R.A. 0h. 37m. 17s. Dec.N.40 degrees 43.4') enlarged 3.4 times, scale 1mm to 24 seconds of arc, taken near Liverpool, December 29th 1888 between sidereal time 1h. 38m. and 5h. 45m, with an exposure of 4 hours.

Positive on glass

1906

Photograph of the Pleides star cluster with nebulosity (M45), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 4 hours on 8th December 1888 at his observatory & home at Maghull, near Liverpool.

Photograph of the Pleides star cluster with nebulosity (M45)

1888

Photograph of the Dumb-bell Nebula (M27), taken by Isaac Roberts using a twin telescope (20-inch reflector & 7-inch refractor) by Howard Grubb of Dublin. Taken with an exposure of 3 hours on 3rd October 1888 at his observatory & home at Maghull, near Liverpool.

Photograph of the Dumb-bell Nebula (M27)

1888