Part 3 (1/2)

_First_, in a cast-iron pot melt the lead to about 800, or a dull red.

_Second_, clean off the dross.

_Third_, add (to a 15-pound pot) 1/2 pound of sulphur in three applications. Each time mix the sulphur thoroughly with the metal with a long stick.

_Fourth_, add tin before the last application of sulphur. Mix thoroughly.

_Fifth_, pour off two bars and look for the frosty streak in the center. Add a little more tin, if necessary.

TO MIX WIPING SOLDER.--

_First_, proceed as described in 1/2 and 1/2, melting the metals and _burning_ out with sulphur, adding the percentage of tin according to the preceding table. Then test the solder for bright spots on the under side.

_Second_, keep the metal thoroughly mixed when burning and keep all dross cleaned off the surface.

The working heat of wiping solder is 500F. Sulphur is used to collect all zinc and dross. The sulphur should come in contact with all parts of the metal. This is why the metal should be stirred when the sulphur is put in.

A few good points in the economical care of solder are listed below.

CARE OF 1/2 AND 1/2 SOLDER.--

_First_, do not drop melted solder on the floor or dirty bench.

_Second_, use all small ends by melting on a new bar.

_Third_, put clean paper under work and use droppings.

_Fourth_, have the mold free from dirt when pouring.

CARE OF WIPING SOLDER.--

_First_, do not heat red hot.

_Second_, do not file bra.s.s where the filings will get into the solder.

_Third_, do not allow lead chips to get into the solder.

_Fourth_, clean the solder occasionally.

_Fifth_, learn to distinguish solder from lead by its hardness.

_Sixth_, have different-shaped pot for lead and solder.

_Seventh_, do not _tin_ bra.s.s by dipping into solder.

_Eighth_, do not put cold or wet ladle into hot solder.

A pot holding about 15 pounds of solder is the size commonly in use.