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Glass positive of Pluto discovery

Glass positive of Pluto discovery

1930
Glass positive:- Jupiter

Glass positive:- Jupiter

1915
Glass positive:- Saturn

Glass positive:- Saturn

1909-1921
Glass Positive:- Halley's Comet

Glass Positive:- Halley's Comet

1910
Glass positive:- Jupiter

Glass positive:- Jupiter

1917
Comet, 1910 I. (Daylight) V.M. Slipher

Comet, 1910 I. (Daylight) V.M. Slipher

1910
Glass positive of:- The new planet Pluto. Lowell Observatory 42-inch Reflector. Focal length 220ins. March 5d 3h 44m. C.O. Lampland. 12"x8". (Prepared from silver print [from R.A.S. N.416] lent by Sir James Jeans)

Glass positive of the 'new planet Pluto'

1930
Positive transparency on film, size 12" x 10", five phases of Venus Lowell Observatory, 1919, (prepared from print purchased from the Lowell Observatory)

Positive transparency on film

1919
Glass positive:- Halley's comet, V.M.Slipher, Lowell Observatory 1910, May 7, Exposure 24 min, 6 1/2" x 8 1/2"

Glass positive:- Halley's comet

1910