Images scanned from a collection of mostly black and white photographs relating to specific contracts. Photographs seem to have been brought together in an album for the purposes of publicity and marketing. Many of the photographs are annotated with useful contextual information such as dates, locations and names of designs.
See https://archiveshub.jisc.ac.uk/glaas/data/gb248-stod/200/stod/200/2/16/2/4 for catalogue.