88 



THE WORLD'S ADVANCE 



the suggestions offered are followed, 

 burned bearings will be less frequent, 

 and a considerably higher efficiency will 

 result. 



Regarding the tabulated lubricants, 

 several important points should be borne 

 in mind. The compound, S, is common- 

 ly known as soda water, and its com- 

 position can be varied to a certain 

 extent. It should not, however, be 

 allowed to become caustic, or it will 

 injure any metal with which it comes 

 in contact. Where lard oil is re- 

 ferred to, No. i pure raw lard oil is 

 meant. The machine oil mentioned in 

 the tables and in the oil compounds 

 should be pure mineral oil very fluid, 

 rather viscous, and having a flash point 

 of about 500 degrees F. 



Contributed by 



F. B. HAYS. 



Porcelain Tube Sharpens Knife 



An unglazed porcelain tube or cleat 

 makes a good whetstone for sharpening 

 a jack-knife. Either of these can be 

 secured at any electrical supply store at 

 a cost of a few cents. 



Contributed by 



O. S. WADE. 



Broom Holder Made from Spring Wire 



A handy holder for brooms when not 

 in use can be made from stiff spring wire 

 bent to the shape shown in the accom- 



p a n y i n g 

 drawing and 

 fastened with 

 brads to a 

 small wood 

 block which 

 may be sus- 

 pended from 

 a screw - eye 

 driven in the 

 wall. The 

 wood can be 

 painted to 

 match sur- 

 roundings. 



Contributed 

 byH. DOLPH. 



A Home Made Portfolio 



A cheap portfolio can be made from 

 four ordinary envelopes by gluing the 

 flap of the first to the face of -the second; 

 the flap of the second to the face of the 

 third, etc. Different sizes of envelopes 

 can be used for various requirements. 



Contributed by 



WILLIAM OJA. 



To Remove Tarnish from Copper 



Tarnish may be removed from cop- 

 per by simply rubbing the surface with 

 a common ink eraser. The "grit" in 

 the eraser removes the tarnish without 

 scratching the metal. 



Contributed by 



WILLIAM A. CAWLEY. 



Hints for Motorists 



In nearly every case of a slipping 

 clutch the difficulty can be overcome by 

 the application of carbide ashes to the 

 face of the clutch. If carbide ashes are 

 not available, a good substitute is either 

 tire mica or tire talc. 



A useful starting crank holder can be 

 made from an ordinary screen door 

 spring and a harness ring. The ring 



