Investment casting Inlet-outlet cover of a valve for a nuclear power station produced using investment casting
Maiden Castle in England is one of the largest hill forts in Europe. Photograph taken in 1935 by Major George Allen (1891–1940). Hill fort
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A pictogram, also called a pictogramme, pictograph, or simply picto, and also an 'icon', is an ideogram that conveys its meaning through its pictorial resemblance to a physical object. Pictographs are often used in writing and graphic systems in which the characters are to a considerable extent pictorial in appearance.
"No Dogs!" Ideogram
Diffusion of metallurgy in Europe and Asia Minor. The darkest areas are the oldest. Bronze Age