THE VESSEL, THE APPARATUSES AND THEIR APPLICATION. 



II 



See: «Ergebnisse der Plankton -Expedition der Humboldt -Stiftung. Vol. I. B. Dr. Victor Hensen, 

 Methodik der Untersuchungen». 1895. Of these were used: 



The large vertical-net. The diameter of the net ring 2 meter, silk-cloth No. 3. 



The middle-sized vertical-net. Diameter i 1 ^ meter, silk-cloth No. 3. 



Plankton-net for quantitative capture. Silk-cloth No. 20. 



The small Plank ton -net [Apsteiri's model). Silk-cloth No. 20. 



Closing- net (Hensen' s improvement of the v. Petersen & Chun net). Silk-cloth No. 20. 



Fig. 4. Trawl-winch. 



Cylinder- net for capture when the vessel was going full speed. Silk-cloth No. 19. 



Further particulars concerning the application of the apparatuses will be given later on at 

 Plankton-work. 



The trawl-winch had 2 cylinders with a diameter of 10 inches, piston stroke 10 inches 

 (the boiler pressure was 65 lbs. pr. square inch). The crank-shaft of the winch worked through gearing 

 a main-shaft, the ends of which were supplied with drums, a small one for warping, and a larger one 

 the diameter of which was 1 fathom, for the trawl-wire. By means of a shifting slide, the turning, 

 direction of the winch could be shifted for heaving in or paying out 



2* 



