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Tar must not be used alone, for when exposed to the sun and air, it becomes hard and binding, and hinders the growth of the plantation. Grease will not have this effect, and the scent of the tar is highly obnoxious to hares and rabbits. PLASTERS. Common plaster is made of six pints of olive oil, and two pounds and a half of litharge finely powdered.
Presently, as the heat of the mass vaporized the water in the sand below, the sheet of litharge, still slightly fluid, began to heave and swell, and a number of small cones rose from its surface. Some of these cones reached the height of four inches, and then burst at the top, sending out a shower of red-hot fragments. I removed one of these cones when the litharge was cool.
This is why you often see the name Goodyear on the bottom of rubbers. Rubber overshoes were improved at once. As they now are made, the rubber is mixed with sulphur, whiting, litharge, and several other substances. An honest firm will add only those materials that will be of service in making the rubber more easy to mould or will improve it in some way.
The mass of molten lead and silver is drawn off, and placed in a large oven with a rotary bottom, into which tongues of flame are continually driven until the lead in the compound has become once more oxydized, forming litharge, and the silver is left in a pure state. This is the most simple method of purifying, or "benefiting" silver.
The following goods, however, were excepted: alum, lead, lead-ore, tin, tanned leather, copperas, coals, wool, cards, white woollen cloths, lapis calaminaris, skins of all sorts, glue, coney hair or wool, hares wool, hair of all sorts, horses, and litharge of lead.
It must not be suffered to boil; and before serving, add two spoonfuls of vinegar. Garnish with crimped parsley. INVISIBLE INK. Boil half an ounce of gold litharge well pounded, with a little vinegar in a brass vessel for half an hour. Filter the liquid through paper, and preserve it in a bottle closely corked.
Take 2 oz. of gum sandarach, 1 oz. of litharge of gold, and 4 oz. of clarified linseed oil, which boil in a glazed earthenware vessel till the contents appear of a transparent yellow colour. This will make a good varnish for the final coating for enamelled and japanned goods.
Gum anime, 8 lb.; clarified linseed oil, 2-1/2 gallons; 1/4 lb. each of dried sugar of lead and litharge; boil, and thin with 5-1/2 gallons of turpentine; and mix it while hot as above directed. Of course these quantities will only do for big jobs, and as it has to do with metal, it has been thought advisable to include the formula in this handbook.
In China an oil is procured from the seeds of vernicia montana, which, by the addition of alum, litharge, and steatite, with a gentle heat, easily forms a valuable varnish which, when mixed with resin, is employed in rendering the bottoms of vessels watertight. P. Champion, Indust. Anc. et Mod. de l'Emp. Chinois." 114. Formerly it appears to have been different with them.
When you use it, warm the silvered plate before the fire, and with a flat camel-hair pencil stroke it over till no white streaks appear; which will preserve the silvering for many years. Take some linseed oil, rendered drying by boiling it with 2 ozs. of sugar of lead and 3 ozs. of litharge for every pint of oil till they are dissolved, which may be in half an hour.
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