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Oriented Marine Cores: A Description of New Locking Compasses and Triggering Mechanisms.

机译:定向海洋核心:新锁定罗盘和触发机制的描述。

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While core-orientation data are becoming more and more necessary for marine sedimentological studies, there are no rugged, inexpensive, or convenient compasses that are insensitive to the ambient pressure, the inclination of the corer, and the bottom impact. This paper describes some instruments designed in an attempt to overcome these problems. A hemispherical compass, a free-floating spherical compass, an inexpensive 'compass smasher,' and some proposed simplified models of these are described. The triggering mechanisms consist basically of a stretched wire fastened to a yielding point on the corer, this point being (i) a glass shear pin snapped off by the sediment, (ii) a tiny nose lever turned up in the same way, or (iii) a releasing lock positioned on a mobile part of the corer. (Author)

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