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The best solder in the world is now made by dissolving zinc in muriatic acid until it becomes thoroughly saturated, then add pull verized sal ammoniac, boil to a proper con sistency and decant for use. The advantage of this solder is that oil, rosin, Sc, are dis pensed with, and 1t k not nessary to clean the metal, howeye rusty All that is nesses- sary is to apply this solution, with 3 feather or bit of sponge. This important improve ment is stated i'll the late Report from tlaa pa. tent office.