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Solder for Iron

Fuse together 67 parts copper and 33 parts zinc. Or: 60 spume has disappeared from the surface. parts copper and 40 parts zinc. 3517. Hard Solder for Copper or Brass. Take 13 parts copper and 1 part zinc.

Or: 7 copper, 3 zinc and 2 tin.

When the liquid appears clear, the composition is ready to be poured out to cool and concrete; afterwards, being ground to a fine powder, it is ready for use. To use this composition, the steel to be welded is first