The relation between illumination and visual efficiency
Subtitle: the effect of brightness contrast
By: by H.C. Weston ...
Publisher: H.M. Stationery off.
Published: 1945
Place of publication: London
Language: eng
Number of pages: 35
Subjects: Sight; Ability -- Testing; Industrial efficiency
Notes: At head of title: ... Medical research council Industrial health board ...
Cover title.