936 



Popular Science Monthly 



To Prevent Steel from Rusting 

 After Soldering 



SOLDERING acid will cause steel 

 surfaces to rust rapidly after the job 

 is finished if not thoroughly cleaned off. 

 If there is much of this work to be 

 done it is well to have a bottle on hand 

 filled with a solution of ordinary washing 

 soda. When through soldering apply 

 the soda water and wipe dry. A block 

 can be made to hold both the acid and 

 the soda water bottles where they will be 

 convenient for the work. 



Luggage- Carrier to Attach to 

 Your Bicycle 



THE front fork of an old bicycle 

 frame and a rectangular board will 

 make a practical luggage-carrier for a 

 bicycle. 



Cut off the steering tube about i in. 

 above the crown of the fork. Remove 

 the outside nuts which secure the rear 

 axle, slip the holes in the jaw-end of the 

 fork over the axle-ends and replace the 

 nuts. 



Bore a hole in the board so as to per- 

 mit the sawed-off steering post to enter 

 it. Cut slots in the other end to permit 

 the board to fit around the seat-post. 

 A strap will hold the board-end securely 

 to the scat-[)()st. Make it of metal and 



A board and the front fork of a bicycle 

 make an excellent luggage - carrier 



Automobile Carbureter for Heavy 

 Fuel Oils 



THE automobile carbureter illustra- 

 ted is designed for use with low grade 

 or high grade gasoline, naptha or 

 kerosene, or a mixture of these. It 



QHAUST 

 GAS INU.T 



EXHAUST 

 GAS OUTLET 



CONNECTION WITH 

 STARTING BATTERY \ 



GASIFICATION 

 -CHAMBER 



VAPORIZATION 

 CHAMBER 

 MECHANICAL ATOniZtR 

 BEARINGS 

 CENTER OPENING 

 THROTTLE 



A carbureter specially designed so that 

 low or high grade fuel oils may be used 



differs from other types in that the 

 passage of an electric current through 

 a coil of wire connected with the storage 

 battery of the car's ignition, lighting or 

 self-starting system is placed below the 

 throttle to heat the mixture enough to 

 gi\e ins.tant ignition when starting. 

 This is necessary because low grade 

 fuels, such as kerosene, will not vaporize 

 sufficiently when cold to form an explo- 

 sive mixture. In most other carbureters 

 using heavy fuels, the motors are started 

 on gasoline and then switched o\er to 

 the hea\y fuel. 



The coil only serves to start the 

 motor, after which the current is turned 

 off. After the motor is started the fuel 

 is kept heated by passing the exhaust 

 gases through a chamber surrounding 

 the top of the carbureter between 

 the throttle and the point of attach- 

 ment, to the intake cylinder of the 

 manifold. 



fasten with screws to the end of the 

 board. Dimensions can be made to suit 

 individual cases. — Seymour Clark. hammer. This starts the rust. 



A NAIL may' 

 it is first s 



be more easilv drawn if 



