. Manual of the natural history, geology and physics of Greenland and the neighbouring regions / prepared for the use of the Arctic expedition of 1875, under the direction of the Arctic Committee of the Royal Society and edited by T. Rupert Jones. Together with Instructions suggested by the Arctic Committee of the Royal Society for the use of the expedition / published by authority of the Lords Commissioners of the Admiralty [microform]. Natural history; Scientific expeditions; Sciences naturelles; Expéditions scientifiques. ALLMAN. âUSE OP THE TOWING NET. 58 :. surfin'c )i(ls Imvc â < s«
. Manual of the natural history, geology and physics of Greenland and the neighbouring regions / prepared for the use of the Arctic expedition of 1875, under the direction of the Arctic Committee of the Royal Society and edited by T. Rupert Jones. Together with Instructions suggested by the Arctic Committee of the Royal Society for the use of the expedition / published by authority of the Lords Commissioners of the Admiralty [microform]. Natural history; Scientific expeditions; Sciences naturelles; Expéditions scientifiques. ALLMAN. âUSE OP THE TOWING NET. 58 :. surfin'c )i(ls Imvc â < s«'c'ur(Ml for when of thoir 0 closely (l to (11s- hiinscir, nay well ley form ; rine to preadlii;; The cii- 1 same as eoUeclecl HOD of NFMALS It. By lul open lirongh bodies loiitli is ssel by bunt- isef'ul it :oss its mouth stronj^ t net is to be [eurely lowing a reel ill tlu! kat, ov I ay be way Irface lating on or near the surface of the sea in the way of the net as it is thus towed behind the vessel, will necessarily pass into it; and after it has been allowed to remain out for a period varying with the abundance of surface life in the sea at the time, it is to be hauled in and examined. Though the richest results are usually obtained by using the towing net close to the surface of the sea, it will frequently bo found important to employ it at various depths, in order to obtain information regarding the organisms which either habitually or temporarily iidiabit /ones other than the most superficial one. For this purpose the net is to be weighted; the weight attached to it depending on the depth to which it is desired to sink it, and on the velocity of the ship. Care should be taken that while the net is out the motion of the vessel be not interrupted, and that sufficient way be given to keep the net constantly distended in its passage through the water. It will generally be advisable to employ Jwo nets at the same time, one working close to the surface, and tlu;
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Keywords: ., bookcentury1800, bookdecade1870, books, booksubjectnaturalhistory
