Page:Popular Science Monthly Volume 91.djvu/916

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���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

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