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Diagram of James Watt's steam indicator
ARP23A13_060

Diagram of James Watt's steam indicator

A combined Semaphore and Light Railway Signal
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A combined Semaphore and Light Railway Signal

A Semaphore Signal on an American railroad
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A Semaphore Signal on an American railroad

A Dwarf Semaphore Signal and Split Switch on an American Railroad
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A Dwarf Semaphore Signal and Split Switch on an Am...

Photograph showing the antenna for the new Raytheon Radar, a weather-sealed 30-inch plastic dome shown here installed over pilot house of the Fury II of Newport Beach, California
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Photograph showing the antenna for the new Raytheo...

A Semaphore Signal on an American railroad
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A Semaphore Signal on an American railroad

Cut-throat business in Wall Street, 1881
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Cut-throat business in Wall Street, 1881

Von Guericke's
ARP07104_460001196

Von Guericke's