288 



Popular Science Monthly 



Emergency Bolts 



TWO short bolts may often be made 

 to serve as one long one as shown 

 in Figs. I and 2, when no long bolts are 

 at hand. The two bolts A and B are 



ca 



The nuts shown practically double the 

 length of the bolts 



coupled together by means of the nut 

 C. When two timbers are to be fastened 

 together as shown in Fig. 2, it may be 

 necessary to drill a recess M in one of 

 the pieces to hold the coupling nut C 

 but often the bolt is used in the manner 

 shown in Fig. 1, where there are two 

 projecting end pieces. In this case it 

 will not be necessary to make room for 

 the nut. 



Renewable Fuses 



AN attachment plug can be con- 

 verted into a renewable fuse by re- 

 moving the flexible cord and connecting 

 a length of fuse wire across the ter- 

 minals. The plug should be inserted in 

 series with the apparatus. 



T 



The Care of Paint Brushes 



HOSE who have only occasional 

 use for paint brushes find difficulty 

 in caring for them, as it is expensive to 

 buy new brushes for every job. The 

 following will solve the problem : 



Procure a dish (a tin can will do) and 

 fill with water high enough to cover the 

 bristles of the brushes. Then pour in 

 a small quantity of lubricating or ma- 

 chine oil. 



Next wrap the bristles in paper, kept 

 in place with an elastic band or a tied 

 string, and place in the dish of water 

 with the oil floating on top. 



The oil prevents the evaporation of 

 the water and the rusting of the iron 

 brush parts. 



The paper wrapping keeps the bristles 

 in shape, and prevents contact with the 

 oil. 



Lengthens Life of Blow-Torch Burners 



WHEN used constantly, the brass 

 tube through which the flame of a 

 blow torch passes is rapidly burned 

 away, so that complete new^ burners 



The attachment plug is converted into a 

 renewable fuse 



Money is saved when the burner of the 

 blow torch is made detachable 



must be frequently attached. This 

 rather costly procedure can be avoided 

 if the actual "business end" of the burn- 

 er is made detachable, or renewable. 



Several short lengths of brass pipe, 

 equaling in size that of the burner it- 

 self, should be procured. With a hack- 

 saw cut oft an inch or so from the end 

 of the burner and thread the remaining 

 end. A narrow ferrule, or coupling, 

 should be tapped to fit the threads, and 

 the brass tips threaded to correspond 

 with the shortened burner, ^^'hen one 

 tip is burned down, it can be quickly re- 

 placed by a new one. 



