900 



Popular Science Monthly 



pellets pass, from becoming clogged on ac- 

 count of the oxide from the copper, the 

 inventor tinned the passage. As a further 

 means of keeping the new soldering iron up 

 to its maximum efficiency, he made the 

 part of the iron containing the tinned pas- 

 sage easily detachable, so that there would 

 be no difficulty about cleaning and re- 

 tinning the passage occasionally. But since 

 the tin is not exposed to the air, it lasts 

 much longer than it would if it were on the 

 outside. If the copper should be allowed 

 to become red hot, or "burn up," as it is 

 called, it would, of course, destroy the tin; 

 but if the tool is kept at the right soldering 

 heat the tinning will last almost indefinitely. 



A lever operated by 

 the thumb of the 

 hand holding the 

 soldering iron feeds 

 the solder pellets 

 down the hollow 



shank to the point There ig Uttle difference in appearance 



between the new iron and ordinary types 



Doing the Work of Three Hands 

 with Two, on a Soldering Job 



WHEN a careful workman has a diffi- 

 cult soldering job he often feels 

 that two hands are not enough; yet a 

 helper, especially if he is inexperienced, is 

 more likely to be in the way than helpful. 

 So thought Ray M. Tilton, of Panora, 

 Iowa, when he first began work on a solder- 

 ing iron which would hold its own solder 

 and apply it where it was needed, leaving 

 the operator's left hand free to hold the 

 work. Mr. Tilton employs a magazine 

 in the handle of his soldering iron. In this 

 the solder is kept in small pellets, which 

 may be fed down the 

 hollow shank directly 

 to the inside of the hot 

 copper point of the 

 iron. Naturally when 

 the solder pellets en- 

 counter the hot point 

 they melt and flow in 

 liquid form directly on 

 the spot to be soldered . 

 In order to prevent 

 the passage in the cop- 

 per, through which the 



H 1 



Cold food, 

 container 



Airholes 



Asbestos 

 lined wall 



Spring' / Charcoa 

 Air chamber burner 

 A compact food container with com- 

 partments for hot and cold food 



The "Complete 

 Dinner" Contain- 

 er for Long Trips 



ERE is another 



ingenious "full 



dinner pail" which 



keeps hot things hot 



and cold things cold. 



It is the invention of 



Julius E. Heimerl. 



It has three separate 



compartments, one 



for hot foods and one for fruit, cake and 



bread, etc. The third holds a fuel box. 



The container itself is a metal box having 

 a handle like that of a pail and a lining of 

 heat-insulating material. The hot meat 

 and vegetables are placed in the compart- 

 ment directly over the fuel box. The heat 

 from bits of burning charcoal in the fuel 

 box keeps the food piping hot until served. 

 Holes are provided in the walls of the 

 compartment for fruit and foods to be 

 served cold, so that air may circulate 

 freely through it. In the flanged cover of 

 the cold food compartment a cup is 

 set which may be used as a food con- 

 tainer or as a drinking cup. Another 

 cup fits over it as a 

 cover. This, too, may 

 be used as a drink- 

 ing cup. Just above 

 the fuel box is a space 

 large enough to accom- 

 modate a coffee pot, 

 so that by adding 

 enough charcoal to boil 

 the water, coffee or 

 other beverages may 

 be readily piepared as 

 needed. 



Drinking cups 



Dead air 

 compartments 



