"Raylite 28" distortion-free illuminated hand magnifier with 64mm diameter aspheric acrylic lens 1950-1959
"Monarch" stand magnifier with 153x104mm (aspheric) acrylic lens and ivory-coloured supports 1950-1959
Eye-piece micrometer inscribed E.6 in wood mount with brass frame divided circle (120 divisions numbered from 0 degree to 60 degrees) and steel screw, 2 threads in position Filar micrometer by William Herschel, 1780-1800 1780-1800
Ultraviolet lamp, sun ray, metal, by Hanovia, from Messrs. Englehard Industries, British, 1910-1930 Ultraviolet lamp, Slough, England, 1910-1930 1910-1930
Glass vacuum tube containing mercury, used as element in hospital sun lamp, by Hanovia Lamps of Slough in 1928 Glass vacuum tube used in a hospital sun lamp, Slough, England, 1928 1928