Here is a cement for iron railings, gratings to stoves, etc., which, it is claimed, will withstand the blows of a sledge hammer: Mix thoroughly equal parts of sulphur and white-lead with about one-sixth proportion of borax. In applying, wet the mixture with strong sulphuric acid and place a thin layer between the two pieces of iron and press firmly together. In five days it will be dry and solid like welding.
For a cement to mend kerosene lamps, or secure them to the standard when they have become loose: Resin, 3 parts; caustic soda, 1 part; water, 5 parts, mixed with half its weight of plaster of paris. This cement sets firmly in about three-quarters of an hour and has great adhesive power. It is not permeable to kerosene, and is a low conductor of heat. Hot water attacks it but superficially.
(1) To fasten labels on polished nickel, dissolve 400 parts by weight of coarsely powdered dextrin in 600 parts of water. To this add 10 parts of glucose and 20 parts of glycerine, and heat these ingredients to 194 degrees Fahrenheit.
(2) Dissolve 400 parts by weight of dextrin in water, this fluid to be further diluted by the addition of 200 parts by weight of water. Then add 20 parts of aluminum sulphate and 20 parts of glucose, heating the compound in a steam bath to 194 degrees Fahrenheit. At this, the mass which is at first thick, becomes clear and thinly fluid. The first of these cements is probably the best.
For a cement for leather and iron, first paint the iron with either white or red lead. After this coating dries, cover it with a cement made of the best glue softened by soaking in cold water, and then dissolve in moderately warm vinegar, to which is added one-third of its volume of white oil of turpentine, and after it is intimately stirred in, it is applied while warm with a brush and the leather is pressed upon it.
(2) Digest 1 part of crushed nut galls for six hours with 8 parts of distilled water. Carefully strain the mass; then make a dissolution of glue soaked in its own weight of water for 24 hours. The infusion of galls is warmed and spread on the leather while the glue solution is put on the roughened surface of the heated metal. The dampened leather is pressed upon it, and when dry its adherence is so firm that its removal is impossible without tearing.
For a leak in lead pipe for hot water take a solder made of 2 parts tin to one of lead, and use with a mixture of resin and sweet oil as a flux.
A cement for leaky boilers (steam or hot water) consists of 2 parts of powdered litharge, 2 parts of fine sand, and 1 part of slacked lime. Mix with linseed oil and apply quickly.