Mechanical Movements. Steamboat Signals.

Scientific American 7, 6.11.1847

The Admiralty in England having notified that they intended to adopt a green light instead of the usual self-colored light, for steamers, some of the steam packet companies objected to the change, and being furnished with the geen light, tested it with the red and natural colored lights, and the trial resulted in the utter condemnation of the Admiralty green light. The three lights were placed in a line on the coast some miles distant, the green appearing far more distant as well as far less distinct than the rest.

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