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 page directs the use of hazardous substances — such as benzine, gasoline, lye, or strong acids — for household tasks. These materials are highly flammable, corrosive, or poisonous, and the practices described have caused fires, burns, and poisonings.
This information has been left in for historical purposes but should not be acted upon.
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Heating, Lighting, and Refrigeration: Apply
Or mix 4 ounces of isinglass, 4 ounces of alum, and 2 ounces of yellow soap, and dissolve in hot water to form an emulsion about the consistency of milk. Apply with a stiff brush to the wrong side of the fabric, rubbing thoroughly. Remove the exa 定全오하요 WATER b d e f a. Incandescent gas or gasoline gas at $1 per 1,000 ft. costs 1c. per hour. Equals breath of 3 persons; b. Acetylene gas costs c. per hour. Equals 2 or 3 persons; c. Kerosene lamp costs ic. Equals 7 or 8 persons; d. Open flame gas costs c. Equals 6 persons; e. Electric bulb costs 1c. Consumes no oxygen; f. Candles Ca cost 6ic. Each candle equals equals 12 12 persons. cess by sponging with water, or with a brush dipped in water, and rub smooth with a dry brush.
Or dissolve pure India rubber and turpentine to a thin solution, and apply with a brush. Afterwards apply a coating of sugar of lead dissolved in water.
To Waterproof and Color Black.- Raise to a boil 4 quarts of linseed oil and stir in 1 ounce of burnt umber, 1 ounce of acetate of lead, and 15 ounces of lampblack. Dry and apply a second coat of the same solution, leaving out the sugar of lead. Allow this to dry and rub it down with a stiff bristle brush. Apply a third coat if desired.
Or raise to a boil 4 quarts of linseed oil. Add 3 ounces of burnt umber, 2 ounces of sugar of lead, 1 ounces of sulphate of zinc, 2 ounces of Prussian blue, and 1½ ounces of verdigris. Stir these into the oil and add 10 ounces of lampblack, stirring vigorously. Apply with a brush as in painting. Two or three coats of either of these mixtures should give a hard, durable waterproof surface of a black color and having a high gloss.
To Waterproof Canvas Tents or Awnings.-Mix 8 pounds of white lead with one fourth by bulk spirits of turpentine. Stir in 1 ounce of sugar of lead and 1 ounce of white vitriol. Dilute with boiled linseed oil to the consistency of paint.
First boil the fabric in suds and rinse clean. Or scrub with soap and water and a stiff brush, afterwards applying water with a brush to remove all traces of soap. Apply the waterproofing with a painter's brush and stretch tightly while drying.
ARTIFICIAL ILLUMINATION Use of Systems of Illumination.- Artificial light is the third most important of the necessities of civilization, taking rank after the items of clothing and shelter. A comparative statement of the annual value of illumination in the United States shows the following results: Acetylene (estimated), about $11,000,000; illuminating gas, $60,000,000; kerosene, $133,- 000,000; electricity, $150,000,000; or total of $360,000,000, being about $4 for every man, woman, and child in the United States. Probably 10 per cent of the light thus generated is wasted through misuse and ignorance, which would amount to forty cents per capita for the entire population of the country, or a total of $36,000,- 000. Including all items pertaining to the lighting industry, it is probable that the grand total of expenditure would reach annually $500,000,000.