A Bottom Sampler for Inclined Rock Surfaces in Lakes

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Abstract
To take quantitative samples of the bottom materials on the sloping concrete sides of a reservoir down to 5m, plates of asbestos-cement composition 0.125m2 were laid down until they had assumed the condition of their surroundings. They were secured by a retrieving wire to a line laid out on the water and were lifted without loss of benthic materials by dropping a cover, fitted to flap-valves, down the wire. The apparatus and 2 freshly lifted plates are illustrated.

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