[Photo-zincographs in On photo-zincography and other photographic processes employed at the Ordnance Survey Office, Southampton].
Longman, Green, Longman, Roberts, & Green[Photo-zincographs in On photo-zincography and other photographic processes employed at the Ordnance Survey Office, Southampton]. Plate no. 3.: Plan. Shewing relative geometrical position of camera & plan for reduction, Fig. 1. Section & elevation on A.B., Fig. 2. [No caption], Fig. 3. Photo-Zincograph. 31 x 24.5 cm.