Source: A.S.S.A. Archives: Peter Smits Collection
Detailed plan of the superstructure for the dome of the 8 inch Grubb equatorial and the transit room equipped with the 3 inch Troughton and Simms transit telescope.
Source: Gray [unpublished]
Natal Observatory drawings for the concrete piers to support the equatorial and transit telescopes. Source: Gray [unpublished]
The dome for the Natal Observatory under construction in the U.K. before shipment to South Africa.
Source: Gray [unpublished])