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
Glass positive, 12"x10" of the planet Pluto, in the neighbourhood of Zeta Geminorum, 29th March 1930. Scale 1mm = 5 secs. of arc Glass positive 1930
Glass positive, 12"x10" of the planet Pluto, in the neighbourhood of Zeta Geminorum, 2.4. 30. Scale 1mm = 5secs. of arc Glass positive 1930
