Water-proof And Fire-proof Cement For Roofs Of Houses





Slack Stone

Lime in a large tub or barrel with boiling water, covering the tub or

barrel to keep in the steam. When thus slacked pass six quarts through

a fine sieve. It will then be in a state of fine flour. To this add one

quart Rock Salt and one gallon of Water. Boil the mixture and skim it

clean. To every five gallons of this skimmed mixture add one pound of

Alum and one-half pound Copperas; by slow degrees add three-fourths

pound Potash and four quarts fine Sand or Wood Ashes sifted. Both of

the above will admit of any coloring you please. It looks better than

paint and is as durable as slate.





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