Unmounted photograph 23" x 29 1/2" of the 72" reflecting telescope at the Dominion Astrophysical Observatory, Victoria, B.C. in Cassegrainian form as used in photographing Stella spectra Unmounted photograph 23" x 29 1/2" of the 72" refl Astronomy 1920
Unmounted photograph 23" x 29 1/2" of the 72" reflecting telescope at the Dominion Astrophysical Observatory, Victoria, B.C. arranged for direct photography at the Newtonian focus Unmounted photograph 23" x 29 1/2" of the 72" refl Astronomy 1920
