Holophone Lumeter lightmeter, wood, metal and glass, made by R & J Beck Ltd, London, 1850-1924, parts missing (Wellcome No. B992 & A196574) Holophone Lumeter lightmeter 1850-1924
Benjamin 'Model B' Lightmeter. 1930-1950. Includes two baffles and a case. Benjamin 'Model B' Lightmeter 1930-1950
