Automatic Buoy

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“Courtney’s Automatic Buoy. A, cylinder, 27 ft. 6 in. long; B, mooring shackle; C, rudder; D, buoy; E, diaphragm; F, ball valves; G, air inlet tubes; H, air (compressed) outlet tube to whistle; I, compressed air inlet to buoy; K, manhole; L, steps; N, whistle.” —The Encyclopedia Britannica, 1910




The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


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2019×2400, 463.7 KiB

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861×1024, 77.0 KiB

Medium GIF

538×640, 41.1 KiB

Small GIF

269×320, 15.5 KiB