I have used the following soldering alloys and can recommend them:
For copper with copper: Copper, 55; zinc, 40; tin, 5.
For copper with iron: Copper, 80; zinc, 16; tin, 4.
For brass: Copper, 45; zinc, 50; tin, 5.
For lead: Lead, 67; tin, 33.
Los Angeles, Cal. J. M. Menegus.
Soldering paste has come into extensive use in electrical work as a flux for soldering, and the following receipt will be found useful in soldering copper wires when the use of an acid would be objectionable. This paste will not spatter or corrode, and the proportions are as follows: Saturate solution chloride of zinc, 1 dram; vaseline, 1½ ounce. William Davis.
To make a solder for small metal articles cut tinfoil into the shape wanted and wet on both sides with sal-ammoniac. Have the surface of the piece clean, place on it the wet tinfoil and then press the parts together firmly and heat until the tinfoil is melted. E. W. Norton.
To make a solder for soldering aluminum, melt together 1 pound block tin, 4 ounces spelter, 2 ounces pure lead and 3 pounds phosphor tin. When using, clean the work with benzine and apply with a heated copper bit in the usual manner.
Lynn, Mass. L. C. Carr.
A method of soldering that I noticed electricians using in soldering wire is as follows: The solder is melted in a pot and then poured over the joints to be soldered, by means of a small dip ladle. Then acid, paste or stick flux is applied, and the solder again applied. This makes a good joint. The solder which drops from the joint is caught by a second ladle, or in the solder pot. In some cases, when possible, the piece is dipped in the pot, the flux applied and the work again dipped. It is important in both cases to give the piece a sharp tap after the second application, to knock off any surplus solder. Herman Jonson.
New York City.
To make a solder for gold melt together in a charcoal fire 24 grains gold, 9 grains pure silver, 6 grains copper, 3 grains good brass; this makes a solder for gold ranging from 12 to 16 carats fine. For finer gold increase the proportions of gold in the composition. To make it darker in color lessen the proportion of silver and increase that of copper. Joseph M. Stabel.
Rochester, N. Y.
The most successful solder preparation for soldering aluminum yet secured is made up in the following manner: Melt together 64 parts, by weight, of tin, 30 parts of zinc, 1 part of lead, and a small amount of rosin. All parts, of course, must be mixed together very thoroughly while in molten condition. When thoroughly mixed the alloy should be run out in bars of desired sizes. Clean the surfaces thoroughly and apply the solder. No chemical is required, the rosin used being sufficient to cause adhesion, although it is advisable to heat the parts to be soldered gently to assist in making a good adhesion.
Olney, Ill. T. E. O'Donnell.