McDonald, Allan Claud, 1904-1969, Photograph, PRG 1062/9/1A/31
View of BHAS works 1922
McDonald, Allan Claud, 1904-1969, Photograph, PRG 1062/9/1A/32
Improved tuyere ca. 1916
McDonald, Allan Claud, 1904-1969, Photograph, PRG 1062/9/1A/33
Later tuyere design 1922
McDonald, Allan Claud, 1904-1969, Photograph, PRG 1062/9/1A/34
Improved tuyeres 1929
McDonald, Allan Claud, 1904-1969, Photograph, PRG 1062/9/1A/35
View of Lead Smelting Plant ca. 1969