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Updated: June 29, 2025
Thus the mine appears on the deck of the mine-laying ship before being lowered over the stern. Before the mine goes over, a windlass inside the plummet-sinker is revolved by hand until the length of cable between the plummet and the anchor-chamber has been reeled off equivalent to the depth below the surface at which the explosive mine is to float. Then the entire apparatus is hove overboard.
The plummet and anchor-chamber sink, while the spherical mine proper is kept on the surface for the moment by means of a buoyant air-chamber within. A windlass in the anchor-chamber now pays out the cable between it and the mine as the anchor-chamber sinks. On the plummet touching bottom, the tension in the cable between it and the anchor-chamber is lessened, and the windlass mentioned stops.
The anchor-chamber thereupon sinks to the bottom, dragging down the spherical mine until that is at the selected depth ready for its deadly work. Aerial Attacks on Cities Some of the Achievements of the Airmen in the Great War Deeds of Heroism and Daring Zeppelins in Action Their Construction and Operation.
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