The steam tug HERCULES, built in 1907, navigating on San Francisco Bay.


HERCULES Statistics
Length 151 feet
26 feet
Draft 18 feet aft, 10 feet forward
Gross Tonnage
Engine 3 cylinder, triple expansion
Cylinders 17", 24", and 41" with 30" stroke. 500 Indicated Horsepower (ihp)
Fuel Type Bunker C oil
Boiler Scotch marine fire tube. 16' diameter, 11' 9" long. Four oil-burning furnaces

  • Hercules is a steam powered tug built for ocean towing
  • The 151-foot ship, of riveted steel construction, still contains her original triple expansion steam engine
  • Built on the East Coast in 1907, she towed her sister ship from Camden, New Jersey around South America to San Francisco
  • Hercules also towed sailing ships, disabled vessels, barges, log rafts, a cassion (a steel structure used for closing the entrance to locks) for a dry dock at Pearl Harbor, and a cassion to help build a Panama Canal lock
  • The tug usually carried a crew of three firemen, three oilmen, a chief and two assistant engineers, three deckhands, cook, two mates and a captain

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