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Cements (Rosendale Cement Slaked lime)

Rosendale Cement Slaked lime, 1 bu.; calcined clay, 14 bu.; washed Is made by calcining the limestone or cementsand, 14 bu. Concrete.

Unslaked lime, 3 bu.; sand, 3 bu.; gravel, 2 bu.; broken stone, 4 bu.

Cement. stone, found above the Potsdam sandstone and below the Utica slate of the New York survey. It consists of silica, magnesia, alumina, oxide of iron, with some salts of potash and soda. The stone is found in eastern New York, New Jersey, Hydraulic cement, 6 bu. (6-5 London, or 2 New Pennsylvania and Virginia. York bbl.); sand, 6 bu. This amount will suffice to lay 1,000 bricks or 2 perches of stone.

Mortars. 1. Stone lime (unslaked), 1 bu.; sand, 3 bu.

Artificial Hydraulic Cements Are made 1, by combining thoroughly slaked lime with from 10 to 40 per cent. unburnt clay, and burning the mixture in a kiln; 2, by grinding 2. Stone lime (unslaked), 1 bu.; gravel, 10 bu. clay and chalk as directed above for Portland Beton Is superior, in every respect, to concrete. It is made in the same way, using hydraulic instead Mastic. of common mortar.

Sand, 100 lbs.; marble-dust, 100 lbs.; freestone, 100 lbs.; red lead (minium), 3 lbs.; litharge, 3 lbs.; linseed-oil, 21 pts.

Genuine Roman Cement, Or pozzuolana, from the neighborhood of Vesuvius, is a peculiar mixture of silica, clay, and lime, which has been calcined by the volcano. It is used mixed with lime and sand. The following is the formula of Vitruvius: 12 parts pozzuolana well powdered, 6 sharp sand well washed, 9 rich lime, recently slaked. It has the power of rapidly hardening under water.

Artificial Portland Cement.

One hundred lbs. of pure, dry chalk is moistened and ground in a mill with excess of water; to this is added 137 lbs. of pure alluvial clay, and the two are thoroughly incorporated. The mixture is made into balls, which are dried and calcined in an ordinary lime-kiln. Cement; 3, by making artificial pozzuolana from calcareous sand and clay, and calcining it; 4, by the use of silicate of soda: 8 or 10 per cent. of a solution of the consistence of thin syrup, is to be mixed with mortar of fat lime.

Cement for Rooms.

A coat of oxide of zinc (zinc white) mixed with size, is applied to the wall, ceiling or wainscot; over this, one of chloride of zinc, prepared in the same way. The two unite and form a cement smooth and polished as glass.

Parolic Cement.

Take unsalted curd of skimmed milk, press the whey out, dry and pulverize, and warm over a stove. Of this, 90 parts; caustic quicklime, in fine powder, 10 parts; powdered camphor, 1 part.

Mix intimately and keep in small bottles corked perfectly tight. To use, mix the required amount with water with a palette-knife, and apply immediately. To make Cement for Floors.

Earthen floors are commonly made of loam; and sometimes, especially to make malt on, of lime and brook-sand, and gun-dust or anvil-dust from the forge. The manner of making earthen Cement for Cast-Iron.