i8 



The engine has an actual power of 300 horse-power while the 

 main boiler has two hearths of an ordinary tank and boiler. The 

 hearth has an average diameter of ten feet and length of 9 feet 

 while the grate area measures 33 square feet. The main boiler 

 is provided with a surface refrigerating engine which is of the 

 vertical triple expansion type, the diameter of the cylinder being 

 II inches of high pressure, 16 inches of middle pressure, and 29 

 inches of low pressure, the number of rotations being 124 per 

 minute. In case of sailing it is to be disconnected. The ship 

 was newly built by the Imperial Fishery Bureau with a view 

 to use it for the training of students in the Fishery Department. 



(2) Trawl-Fishing Boats. 



A. The Trawl-fishing boats of the Aichi Prefecture 



in use by the Fishery Bureau. 



This boat is extensively used both in Aichi and Miye pre- 

 fectures the length of the boat ranging between 30 and 50 feet. 

 The trawl-fishing boats of this description are most numerously* 

 used in Osaka, Hyogo, Hiroshima and Yamaguchi besides Aichi 

 prefecture. This boat is a kind of a trawl schooner used in 

 Europe and America, but it differs in that the boat has a 

 wooden projection of over 15 feet both in the bow and the aft 

 of the ship at the end of which is attached the hand line of the 

 trawl-fishing nets. The sail is spread to its utmost capacity 

 in the wind, and the boat is floated laterally with the current 

 at the same time, when the net is drawn so that the water line of 

 the boat as well as its lateral resistance is favourably minimized, 

 thus for instance, in a boat whose length from bow to stern is 60 

 feet, its extreme breadth is 12 feet and moulded depth 4 feet. 

 The condition of the fishing ground and the nature of the finny 



