Pair of folding aluminium binoculars, issued to officers in the Boer War, by Aitchison and Company, London, England, 1889-1910 Folding aluminium binoculars 1889-1910
Specimen of the element silicon, 99% Si, 1884-1886 Specimen of the element silicon, 99% Si, 1884-1886
Radalloyd magnetic flow detector, with transformer and carbon steel test piece, showing flaws Radalloyd magnetic flow detector