140 ‘TRANSACTIONS LIVERPOOL BIOLGGICAL SOCIETY.- 
such as water bottles, thermometers, plankton nets, &c. 
There is a derrick on the mainmast, and a single davit 
on the main deck aft. These are used for working lighter 
fishing gear, and other scientific apparatus. Shrimp 
trawl and shank nets are also carried. 
6 set Screws 
9 Ins 
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Fic. 3.—Section of Friction-drive Accessory Winch. 
The scientific apparatus includes:—Two large 
vertical Hensen nets; two medium vertical Hensen nets; 
two large vertical egg-nets: these are Hensen nets 
constructed with coarse silk; two shear-nets (this is the 
Helgoland ‘Scherbrutnetz”’); Petersen's “ Yugel- 
trawl’; ordinary surface tow-nets, of course; the small 
Nansen-Pettersson water-bottle, used in the International 
Fishery Investigations, with reversing thermometer 
frame, and thermometer; and with a set of four Nansen 
deep-water thermometers, all provided with the 
Charlottenburg certificates. Surface thermometers, and a 
set of the Kiel hydrometers and thermometer, are carried. 
Wet and dry bulb air thermometers are fixed on the deck- 
house aft. A self-recording barometer is hung on springs 
