Show ITHE THE BEST METHOD I FOR SOLDERING In soldering two to surfaces It is la very necessary that both be clean dean and bright The work must not be touched with greasy hands nor must the tools tool be dirty A II clean file lilt scraper emery cloth or 01 a little uncut acid la is generally used In preparing preparing pre pre- Ere paring the e surfaces after te which they should be s swabbed with prepared re acid rl The latter Is simply acid Into which pl please pieces of zinc have been Intro Intro- Enough zinc S It added until the action of the acid ceases |