| 释义 |
Petersen grab Marine Biol.|ˈpiːtəsən|
[Named after its inventor, Carl Georg Johan Petersen (1860–1928), Danish marine biologist, who first described it in 1911 (Rep. Danish Biol. Station XX. 47).]
A kind of grab for obtaining a sample of the bed of a body of water, consisting of two jaws semicircular in vertical cross-section and hinged along the top, arranged so as to close automatically on contact with the bottom.
1923Sci. Investigations, 1922 (Fishery Board Scotland) iii. 1 (title) Preliminary survey of the Scottish waters of the North Sea by the Petersen grab. 1950Biol. Rev. XXV. 309 The Petersen grab will only produce reliable results on the softer bottoms. 1970tr. J. Schwoerbel's Methods Hydrobiol. iv. 118 In larger rivers the Petersen grab can be used... The grab weighs 40 kg. |