The parts to be soldered must be thoroughly cleaned by sandpapering or the use of steel wool until the metal shows up bright. [Please select]
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--Before beginning the work of soldering, the parts must be cleaned by filing or sandpapering, and coated with an acid which neutralizes the oxygen of the air. [Please select]
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Good smooth staves should be selected for this purpose, and if one cares to go to little trouble a thorough sandpapering will make a great improvement. [Please select]
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If a planing mill is at hand the stock can be ordered in such a way as to avoid the hard work of planing and sandpapering. [Please select]
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