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Mechanical wing by Leonardo, da Vinci
ARP18A01_145

Mechanical wing by Leonardo, da Vinci

The first TRANSFORMER: The iron ring is wound with two separate coils of wire, A and B. Both coils are wired in sections. Current through A from a battery induces a current in B. Engraving after a ske...
ARP17A30_477

The first TRANSFORMER: The iron ring is wound with...

British ration books from 1941 and 1948. Rationing lasted for 14 years from 1940 until 1954, far
ARP15A00_071

British ration books from 1941 and 1948. Rationing...