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What shape is a mushroom anchor?

 title: 'A cross-section of a multi-story building showing various rooms and provisions.'

The text includes an image of a mushroom anchor[1]. It also mentions 'a mushroom or Martin's anchor'[1]. Both are lying on the sea-bed and weighing two tons[1]. These anchors are a part of mooring cables to help lightships remain at their stations[1].

Space: Our Seamarks By E. Price Edwards 1884

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