(1) For cementing steam joints of iron and water joints, mix iron filings with sulphuric acid, diluted with 1 part acid to 30 parts of water or with wine vinegar, and pack the compound into the joints.
An improved cement for small iron articles is made as follows: Take 2 parts sulphur and 1 part by weight of fine black lead, put the sulphur in an old iron pan, holding it over the fire until it begins to melt, then add the lead; stir well until all is melted, then pour out on an iron plate, or smooth stone. When cool, break into small pieces. A sufficient quantity of this compound being placed upon the crack of the iron pot to be mended, can be soldered by a hot iron in the same manner as a tinsmith solders his sheets. If there is a small hole in the pot, drive a copper rivet in it, and then solder it with the cement.
Red or white leaf in oil 4 parts, iron borings 3 parts, makes a soft cement for steam boilers.
For a cement for steam pipes, which will not require the removal of the injured piece, take 5 pounds of paris white, 5 pounds yellow ochre, 10 pounds of litharge, 5 pounds red lead, and 4 pounds black oxide manganese. Mix with great thoroughness and add a small quantity of asbestos and boiled oil. This composition will set hard in from two to five hours,
(2) A cement for steam pipes is made of:
10 parts Iron Filings,
1 part Sulphur,
2 parts Caoutchouc, 1 part Gutta-percha.
A fine cement for stone work is made of equal parts of resin, yellow wax and Venetian red, mixed up together while in a melted condition.
Cement for cementing joints or cracks in iron stoves is composed of clay, salt, sand, coarse iron filings and cow-hair with fresh blood.
Another good cement is composed of salt with water, clay and beechwood-ash.
A mixture in the form of a cement which may be used to stop the cracks in stoves so the smoke will not pass through is composed of glycerine and litharge mixed to a paste. Another receipt is to take equal parts of sulphur and white lead, with about a sixth of borax, incorporating them so as to form one homogeneous mass. When going to apply it, wet it with strong sulphuric acid, and place a thin layer of it between the two pieces of iron, which should then be pressed together.
(2) For stove cement use pulverized clay, 8 parts; fine iron filings, 4 parts; peroxide of manganese, 2 parts, sea. salt, 1 part; borax, 1 part. Thoroughly pulverize, dry and mix. When required for use, make up the required quantity for immediate use into a thick putty with water.
For cementing tin and glass together a putty of pure white or red lead is recommended. Marine glue is also used. A tolerable elastic cement may be made by warming common coal tar until soft, and then mixing rather stiff with Portland cement.