To braze steel or iron without heat take ounce fluoric acid, 2 ounces of brass filings, and 1 ounce of steel filings. Put them all into the fluoric. Touch each part of the work with the mixture, and put them together. Take care that the fluoric acid is put into an earthen vessel. Rochester, N. Y. Joseph M. Stabel.
The following receipt is one that not all jewelers know. It is also a good preparation to clean the hands with; it will not crack the hands if vaseline is rubbed in well immediately after rinsing them off in water.
Make a saturated solution of cyanide of potassium by taking a quantity of water, and dissolving the cyanide in it, until no more cyanide will dissolve. Dip the article in this solution until the dirt is eaten off (this takes but a short time), then rinse off in hot water, and dry in boxwood sawdust. The article will then look better than when new. Parke B. Shee.
St. Paul, Minn.
Take equal parts of beeswax and powdered rosin. Melt the wax, sprinkle in the powdered rosin, and stir until well mixed. If beeswax cannot be had, use paraffine. This composition does not soften the core as does the ordinary paraffine tapers, because the rosin goes into the core when it is baked and hardens it. If paraffine is used it is better to make the tapers by dipping cotton wicking into the melted composition, as the paraffine makes it rather brittle. When beeswax is used, the wicking is not necessary, and the tapers can be formed in the same manner as that employed by pattern-makers in forming beeswax fillets. John B. Sperry.
In the following I give two receipts for die-sinkers' impression wax. In the first the exact proportions of some of the Ingredients are not given, but the maker can use his own judgment, gradually adding more of one than the other until the right consistency is obtained. 1. Beeswax, 6 parts; white wax, 1 part; a small quantity of cornstarch; sufficient Racine castor oil to make it of the desired consistency. Add stearine if too soft. 2. Another receipt is two parts of beeswax, and one part bay-berry wax. I have found powdered chalk useful to remove the stickiness of this wax.
Niagara Falls, N. Y. C. W. Shelly.
It often happens that it is required in the manufacture of goods to make a wax impression of a sample or model. To do this successfully proceed as follows: Oil the surface of which the impression is to be made very slightly with a few drops of oil applied to a little waste. Then take common beeswax, melt it slowly, but do not boil it. Mix it with one or two tablespoon-fuls of lampblack to half a tumbler of beeswax and stir the mixture. In order to make the wax impression show up clearly, take a fine hair brush and brush a little powdered graphite or rouge over the object on which the impression is to be made.
Wallingford, Conn. C. W. Shelly.