1 10 IMPROVED FISHERY HARBOUR ACCOMMODA TION 



different observers, on the size of particles which are 

 moved by currents of different velocities : 



3 in. per sec. = 0*170 mile per hour will just begin to work on fine 



clay. 



6 in. = 0*340 mile per hour will lift fine sand. 

 8 in. =0.4545 will lift sand as coarse as linseed. 



1 2 in. =0*6819 will sweep along fine gravel. 



24 in. = 1*3638 will roll along rounded pebbles 



i in. in diameter. 



3 ft. = 2*045 m il e P er hour will sweep along sl-.ppery angular 

 stones of the size of an egg. 



SEND OR SCEND OF THE WAVES. 

 On this subject the writer has appended some extracts 

 from a communication from Mr. Meik, C.E., to Mr. T. 

 Stevenson. "When passing over a wave with a lO-ft. lift, 

 some of our small colliers would send 7 J to 8 feet, whereas 

 a long screw collier of 180 feet length would only send 

 5 feet. A small sailing collier would probably draw about 

 12 feet water. A large fishing-boat would draw 7 feet, 

 and might send possibly 4 feet, but of course this would 

 vary from the form of hull, and no class of craft differ more 

 in their sections than fishing-boats, very full bodied boats 

 being alone fit for some stations. The send is generally 

 taken at two-thirds of the greatest lift of the wave for 

 ordinary colliers." 



LIGHTHOUSES. 



Every fishing harbour should at least be provided with 

 one lighthouse, or an equivalent arrangement of one or 

 more lamps. Where there are outlying dangers, leading 

 lights should be established, by keeping which in line, or 

 " in one," as sailors term it, the helmsman may be able to 

 avoid such dangers. 



