. Entdeckung berichten. Discovery (Schiff); wissenschaftliche Expeditionen. Ich 82 DISCOVERY REPORTS" cod-end" der Net verjüngt sich eine Leinwand Zylinder E zu verbinden, über und zum Sammeln von Schaufel geklemmt werden zu rutschen. Mit Ausnahme der TYF die Netze zu unseren Designs von der Marine Biologische Association an der Plymouth gemacht wurden. Sie waren alle mit Kupfer behandelten - Seife preserva- als von Dr. W. R.G. Atkins^ beschrieben, der freundlicherweise viel hilfreiche Ratschläge geliefert als auf die Art und Weise, in der sie angewendet werden soll. Trotz der Tatsache, daß die Netze wurden oft unter ungünstigsten Bedingungen gehalten, wurde es auf

• Bildanbieter: Paul Fearn / Alamy Stock Foto
• Bild-ID: RCE3BG
• Dateigröße: 7,1 MB (123,5 KB Komprimierter Download)
• Freigaben (Releases): Model - nein | Eigentum - nein
• Format: 3179 x 786 px | 26,9 x 6,7 cm | 10,6 x 2,6 inches | 300dpi

Weitere Informationen

Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.

Dieses Bild kann kleinere Mängel aufweisen, da es sich um ein historisches Bild oder ein Reportagebild handel

. Discovery reports. Discovery (Ship); Scientific expeditions. i82 DISCOVERY REPORTS "cod-end" of the net tapers to join a canvas cylinder E, made to slip over and be clamped to the collecting bucket. With the exception of the TYF the nets were made to our designs by the Marine Biological Association at Plymouth. They were all treated with copper-soap preserva- tive as described by Dr W. R. G. Atkins^, who kindly supplied much helpful advice as to the manner in which it should be applied. In spite of the fact that the nets were often kept under most unfavourable conditions, it was only on the rarest occasions that a net was found to have rotted: the use of copper soap as a preservative is strongly to be recommended. Specifications of Plankton Nets The design and function of each net will now be described in turn. Full details are included in order that references may be given and repetition avoided in future papers on plankton results. The N 50, designed for the capture of diatoms particularly and the smaller plankton forms generally, is made of the finest bolting silk: that with 200 meshes to the linear inch. Its use formed part of the routine at each full station, a vertical haul being made with it from 100 m. to the surface at a speed not exceeding i m. per second. Like the N 70, next to be described, it is similar in size and mesh to that being used by Professor Hjort^ in his plankton investigations in the northern whaling areas, so that comparisons between the conditions in the two hemispheres may more easily be made. The ring, which has an opening of 50 cm. diameter, is made of galvanized iron, f in. thick with round cross section, and has at three equidistant points a pair of small eyes of | in. opening, one on each side of it, as shown in Fig. 7. These eyes form the points of attachment in front for the three bridles and behind for the lines attached to the bucket and weight. The bridles are of 3 mm. diameter phosphor- --^:^;--____^ ^ bronze rope,

Stockbilder mithilfe von Tags suchen

• bookcentury1900
• bookdecade1920