Demonstrating the physics of pulleys (the more pulleys there are between you and the weight, the easier it is to lift it) at the San Francisco Maritime National Historical Park
(San Francisco Maritime National Historical Park, San Francisco, USA)
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San Francisco Maritime National Historical Park, San Francisco, USA    map
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USA, San-, Francisco, Pulleys, San Francisco Maritime National Historical Park, history, free attraction, museum, seafaring, Hyde Street, SF, United States of America, North America, city, metropolis, town, urban, pulleys, photography, stock photography agency, travel photography, picture, image, buy, photo store, licensing, illustration, commercial use.
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