602 



Popular Science Monthly 



A superheating coil for oil -burning fur- 

 naces gives an even pressure and complete 

 combustion 



Save Fuel for Oil-Burners 



IF the feed-pipe of an oil-burner is 

 lengthened and bent into several 

 convolutions which are placed directly 

 beneath the burner, the oil is thinned 

 and gas is formed, with the result that 

 an even pressure is gained and more 

 heat per unit of oil is obtained. In 

 many cases it wnll be found that the 

 increased pressure will be sufficient to 

 justify doing away with the pressure 

 pump ordinarily used. Care must be 

 taken in installing superheating coils 

 of this type ; otherwise explosions and 

 disastrous fires may result. 



A Speedometer Light for Ford Cars 



THERE are numerous 6-volt speed- 

 ometer lights on the market, but it 

 is very hard to obtain a bulb that will 

 not burn out when used with the cur- 

 rent direct from the Ford magneto, the 

 voltage of which is about 12. If suit- 

 able resistance is placed in series with a 

 6-volt light to cut down the voltage to 

 6 volts, the standard 6-volt light will 

 work very well on a Ford. Twenty-five 

 feet of No. 26 B. & S. gage German 

 silver wire is the proper amount. It 

 may be wound upon a piece of porcelain 

 tubing or any other non-conductor. 

 After it is wound it should be thoroughly 

 wrapped with friction tape to protect it. 

 To install it, one wire from the resist- 

 ance coil can be connected to the bind- 

 ing post where the wire from the mag- 

 neto binding post connects on to the 



binding post of the coil box underneath 

 the hood. 



The resistance can be fastened to the 

 dash underneath the hood by taking 

 several turns of tape around the coil and 

 driving a tack in each end of the tape. 

 This will hold it in place very satis- 

 factorily. The other wire from the coil 

 should be run to the other side of the 

 car, being careful not to [;et it grounded 

 to any metal parts of the car. It should 

 then pass through a hole drilled through 

 the dash at the exact place where you 

 want the light located, through the light, 

 and then should be grounded to the iron 

 frame of the machine at any convenient 

 place. It is best to buy a speedometer 

 light with a pull-chain switch socket, 

 but if you cannot obtain this kind con- 

 veniently you will have to get a small 

 dash switch of some kind and place it 

 in circuit with your light. This light, if 

 carefully installed, is very satisfactory. 

 The author has one on his car and 

 knows of two others who have used the 

 same idea and are very well pleased 

 with the results. — Ivan M. Wells. 





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Simple barbs of wood attached to piles 



will prevent them from working up when 



driven in quicksand 



Driving Piles Into Quicksand 



WHEN driving piles in quicksand, 

 tmder water, the piles have a tend- 

 ency to rise from V to 3', unless the 

 hammer is left set on them for several 

 hours. To avoid this waste of time, cut 

 up some tough saplings of about 2" di- 

 ameter, into lengths of about 2', and 

 spike them to the piles like barbs, as 

 shown in the illustration. The results 

 are very satisfactory. — J. L. Bayley. 



