Popular Science Monthly 



27i> 



While there are 

 many steering de- 

 vices on the market 

 these three shown are 

 the most popular 



Single plank, with ordinary 

 calk seam 



t 



the 



Single plank.with lap seam 



Single plank, ribband carvel 

 construction 



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Single plank roughly put on 

 and covered with canvas 



Plank put on 

 improperly, not 

 hoi lowed to fit 

 •flat, on frame 



the timer until 

 motor speeds up, 

 and then proceed to 

 adjust the needle 

 valve on the carbu- 

 retor until the best 

 results are obtained. 

 A slight movement 

 of the needle valve 

 will make a great 

 difference in the 

 mixture being fed 

 into the compression 

 chamber. For that 

 reason it is advisable 

 to go slow and try 

 the different points. 

 Too lean a mixture 

 will cause a back fire 

 while too rich a mix- 

 ture will cause the 



motor to slow down. When starting the 

 motor, be careful that the mixture is not 

 too rich. In the case of too rich a mixture 

 close the needle valve until a blue flame 

 is shown through the relief cock. If the 

 motor backs fire on all carburetor adjust- 

 ments the gasoline pipe or needle valve is 

 clogged and does not allow the proper 

 flow of gasoline. 



Never use a wrench or screwdriver on 

 a motor unless you know exactly why 

 you are doing it. If you get a back 

 kick or a sprained wrist from your 

 motor, it is your own fault. Never try to 

 start a motor with the spark advanced. 

 The spark should be retarded before the 

 engine crank is turned over. For throttling 

 or slowing down, the expert uses the throt- 

 tle; the amateur leaves his throttle open 

 and retards the spark and thereby makes 

 the motor back fire, thump and overheat. 



Oil and grease cups should be filled and 



Single plank, hoi low and 

 round style of seam 



I I I I I I I I I I 



Single plank,narrow slats 

 strung on a wire 



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Double plank construction 



Lap strake plank 

 construction 



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Edge nailed construction 

 J K 



l\ \ Plank properly 

 V\\ hollowed and 

 \\\ rounded to fit 

 \V\curve of frame! 



The planking of the hull covers the ribs and frame 

 of the boat and it may be applied in several ways 



starts. 



The three methods 

 of connecting up a 

 magneto for being 

 driven from the fly- 

 wheel of the engine 



a small amount fed 

 from each, always 

 bearing in mind that 

 too much lubrica- 

 tion is almost as bad 

 as too little, as it 

 causes carbon to 

 form in the cylinder. 

 The fuel supply 

 should now be 

 turned on, both at 

 the tank and at the 

 carburetor. The 

 needle valve on the 

 carburetor should be 

 opened slightly and 

 the carburetor 

 primed, as before 

 mentioned, to make 

 sure of a good sup- 

 ply of fuel. As soon 

 all oil cups should 



as the engine 

 be opened. 



In case a four-cycle engine fails to 

 start at once, turn the crank over under 

 varying conditions of fuel and air sup- 

 ply, after making sure that the igni- 

 tion system is operating and that the 

 fuel is flowing into the carburetor. 



The torpedo type of stern is a very popular 

 style and is adapted for shallow waters 



