Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
Cement
These substances are generally employed in a semi-fluid or pasty state to unite bodies in close adhesion, the latter condition being the most favorable for bringing the opposing surfaces into intimate contact. Marine Glue.--Glue 12, water enough to dissolve; add yellow resin 3; melt, and add turpentine 4, and mix thoroughly together.
Cement for Lamps.--Rosin 3, caustic soda 1, water 5, boil; then add half its weight of plaster of Paris. Sets in 3/4 of an hour; not permeable to petroleum.
Cement to Resist a Red Fire, Water, and Oils.--Equal parts of sifted peroxide of manganese and zinc white; soluble glass, sufficient to form a thin paste. See SOLUBLE GLASS.
Another: Pulverized litharge 5 lbs., fine Paris white 2 lbs., yellow ochre 4 oz., hemp cut in shreds 1/2 oz.; this is ready for use when it has been mixed to the consistency of putty with boiled linseed-oil. Liquid Glue.--Glue, water, and vinegar, each 2 parts. Dissolve in water-bath, and add alcohol 1 part.
Cement for Steam-boilers, Steam-pipes, etc.--Red or white lead, in oil, 4 parts; iron borings, 2 or 3 parts (soft), or iron borings and salt water, and a small quantity of sal-ammoniac with fresh water (hard cement). For Holes in Castings.--Sulphur in powder, 1 part; salammoniac, 2 parts; powdered iron turnings, 80 parts. Make into a thick paste. The ingredients comprising this cement should be kept separate and not mixed until required for use.
Cement for Stopping Holes in Cast Iron.--Iron filings, 15 parts; sal-ammoniac, 2 parts; sulphur, 1 part; ground or powdered stone, 2 parts; add water until it is about the consistency of common paste; it is then ready for use. For Making Canvas Water-proof and Pliable.--Yellow soap, 1 pound, boiled in 6 pints of water; add, while hot, 112 pounds paint.
Cement for Rust-joints (Quick-setting).--1 pound salammoniac in powder, 2 pounds flour of sulphur, 80 pounds iron borings (made to a paste with water). Stone and Iron.--When stone and iron are to be cemented together, use a compound of equal parts of pitch and sulphur.
For Cisterns and Water-casks.--Melted glue, 8 parts; linseed oil, 4 parts; boiled into a varnish with litharge. This cement hardens in about 48 hours and makes tight joints.
Rice Glue, or Japanese Cement.--Rice flour; water, sufficient quantity. Mix together; then boil, stirring it all the time.
Cementation is a chemical process consisting of surrounding a body in the solid state with the powder of some other body or bodies, and exposing the whole for a time to a degree of heat insufficient to melt the contents. By this means iron is converted into steel when packed in powdered charcoal, and green bottle-glass into porcelain by sand, etc. See BLISTER-STEEL. Centre. See SPINDLE; LOAM-MOULDING.