Marine Cement

See Glue, Marine.

Maissiatt's Cement, as an air-tight covering for bottles, etc. Melt India-rubber (to which 15 per cent. of wax or tallow may be added), and gradually add finely powdered quicklime, till a change of odour shows that a combination has taken place, and a proper consistence is obtained.

Cement for attaching Metal Letters to Plate Glass. Copal varnish 15 parts, drying oil 5 parts, turpentine 3 parts, oil of turpentine 2 parts, liquefied glue 5 parts; melted in a water-bath, and 10 parts of slaked lime added.

Cement to fasten Leather to Metal

A hot solution of gelatin. With this wash the metal; and the leather, previously stepped in a hot infusion of gall-nuts, is to be pressed tightly on the surface and allowed to cool, when it will adhere very firmly.

Cement for India-rubber

Bisulphide of carbon 4 oz., best India-rubber 1 oz., isinglass 2 drs., gutta percha 1 1/2 oz. - Pharm. Journ.

Cement to fasten India-rubber to Wood or Metal. Dissolve 1 part powdered gum shell-lac in 10 parts of strong solution of ammonia: It is at first slimy, in 3 to 4 weeks becomes liquid, then bard and impermeable. - Druggists' Circular.

Cement for fixing labels to Tin, or other Metallic Substances. Mucilage of tragaeanth, 10 parts; honey 10 parts; dry wheaten flour 1 part.

Japanese Cement

Mix rice flour intimately with cold water, and boil gently.

French Cement

Mix thick mucilage of gum arable with powdered starch.

Common Paste

To a dessert-spoonful of flour add gradually half a pint of cold water, and mix till quite smooth; add a pinch of powdered alum (some add also as much powdered resin as will lie on a sixpence), and boil for a few moments, stirring constantly. The addition of a little brown sugar, and a few grains of corrosive sublimate, is said to preserve it for years.

Luting for Acids

1. Dissolve 1 part of India-rubber in 2 parts of linseed oil, by heat, and work into a stiff paste with 3 parts, or as much as sufficient, of white clay.

2. A concentrated solution of silicate of soda, made into a paste with powdered glass.

Lutes for Coating Retorts

1. Dissolve 1 oz. of borax in 1/2 pint of water, and add slaked lime to form a thin paste. Brush this over the retort, and let it dry gradually. Then apply a coating of slaked lime and linseed oil beaten together. Let it dry a day or two before use, and fill up any cracks which may appear with lime and linseed oil.

2. For bearing a stronger heat: Stourbridge clay, mixed with a little sand to prevent it splitting off: a little cut tow, or horse-dung, or asbestos, is usually added, to increase its coherence. It should be beaten to a stiff paste, and rolled out before application. The glass should be first rubbed over with a little of the lute mixed with water, then placed in the centre of the paste, rolled out to about 1/4 or 1/3 of an inch in thickness, and the edges of the latter raised and moulded to the glass, taking care to press out all the air.