Astronomy, Photographs: -  Roberts (Isaac), F.R.A.S., F.G.S....

Hammer

€1,300

Astronomy, Photographs: -  Roberts (Isaac), F.R.A.S., F.G.S., Maghull.
A. Photograph of Stars in Cygnus, ... taken at Maghull on the 14th Aug. 1887, with 20" Reflector, and exposure of 60 minutes, approx. 29.5cms x 24cms, mounted on card.
B. Photograph of the Great Nebula in Andromeda,.... Taken at Maghull, on the 29th December, 1888, with 20" Regulator and exposure of 4 hours, R.A. oh 39m, Decl. + 40 40'. approx. 29cms x 25cms (11 1/2" x 9 3/4") mounted on card.
C. Photograph of the Nebulae. M.81, 82, and a Nebulous Star in Ursa Major, A.R. 9h. 46m D. + 69   39'. Exposure 3 1/2 hours, 31 March 1889. Enlarged 5 times. Approx. 30cms x 24cms (11 3/4" x 9 1/") mounted on card.
D. Photograph of the Dumb Bell Nebula, M27 Vulpecula, A.R. 19h 54m. D. + 22, 25'. Exposure 3 hours, 3 October 1888. Enlarged 5 times. approx. 30.5cms x 24.5cms (12" x 9 3/4") mounted on card. 
A very important group of 4 Photographs by Roberts, each mounted on board with descriptive letterpress, some of the mounts spotted, otherwise v. good.
As photographs, w.a.f. Ex. Rare. (4)

Provenance:   Birr Castle Estate.

* Roberts, British 1829-1904 A pioneer Astrophotographer, worked from his own Private Observatory in Crowborough, Sussex.