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Show Soldered Joints in Radio Outfit Rosin Core Material Found Best for Making Connections Connec-tions in Set. You do not need to be a plumber in order to make good soldering joints in radio set. Every radio outfit requires re-quires soh'.?rlng Joints which will not pull apart or add high resistance paths hi the circuit. Making a soldered sol-dered joint Is quite easy, provided you have a good, clean iron and the proper soldering compound. The easiest way to keep the Iron clean is to wipe it thoroughly before it Is used to solder a Joint. This may be accomplished by having an old rag handy and wiping wip-ing the Iron off with it before tinr.ing the iron. When the Iron gets dirty or corroded cor-roded from too much heat it may be nibbed with a lump of sal ammoniac j This is a chemical which may be pur-! pur-! chased in any hardware or drug store for a few cents, and should be kept In the soldering kit. It will clean the Iron so that the copper shows up brightly. An electric soldering iron is preferred over the gas-heated Iron, and stays hot longer. The soldering Iron should he well tinned. This Is accomplished by cleaning it first nnd then sticking it into a little powdered rosin and soft solder wire. The market today affords a wire solder with a center cen-ter of powdered rosin. This mnkes a convenient way of combining the solder and binder. When joining two wires together they should first be scraped clean. If tinned bus-bar wire is soldered the solder will stick to It more readily than to the metal surfaces of copper Solder Mrs Equipment Needed to Do a Good Job of Soldering. or brass. Apply the hot iron against the surfaces, at the same time forcing forc-ing down the solder In wire form around the Joint. Do not allow too much solder to get on the joint, as this will make a poor-looking Job. If the solder will not flow around the joint It Is because the joint is dirty or the iron too cool. Do not use acid or soldering pastes around the radio set. They are suro to cause crackling noises in the set after the Joints start to corrode. Rosin Is a good insulator and should be used In place of other binders. Do not try to solder aluminum or iron, as it requires special solder and methods hard for the beginner to master. mas-ter. Copper and brass are very easy to solder after one gets the knack of doing tlie job. Let the joints cool thoroughly before attempting to pull 1 them for testing strength. |