in film of solder before any soldering is done ; this is to ensurethat it is perfectly free from dirt or dust. This process is called tinning the bit. It is quite simple. Heat the iron to a dull redheat, not quite red hot, as the solder would otherwise be destroyed.Then quickly file the four faces… … the soldering fluid and melt off a drop of solder on to the piece ofsheet tin on which is put a little piece of resin. Turn the pointof the bit round and round in the melted solder until it is com-pletely coated. It is very important that the soldering iron shouldat no time be overheated, as this…
Toys
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