
          771

To make a flab for roofs to make them incombustible
Make your lime as before directed , into which put a
pound of clean rock salt to each gallon of water, which
must be entirely dissolved by boiling, and skimmed clear
dissolve half a pound of Copperas, one pound of Allum,
and one pound of potash, to be gradually added & 
mixed witht the Flab; add one pound of glue dissolved
as before, strirring them well - The put in sufficient
lamp black (mixed with Spirit and diluted
with hot water) to give it a slate colour.  This flab
must be put on boiling hot - with one or two coatings
more. To this flab sand or hard wood ashes must
be added. It will look like paint on new shingles,
or like handsome slate - Old shingles must be first
scraped or brushed clean with a stiff broom.  Three
washings will render them incombustible.

The lime must be first slaked with hot water
in a small piggin or [illegible] and  covered to keep in the
steam, then sifted fine to reduce it to a fine powder.
The flab must be thin or thick according to the use
intended. Two coats are best for outside work - 
The glue when dissolved must be passed through a
fine sieve.

Colonel Lambert Cadwalladers Receipt
very durable

[begin right brace]
1 peck of unslacked  lime
Half a pint of whiting
1 gill of powdered allum
1 gill of fine [blown] salt
[end right brace]

Pour boiling water in and mix it
as thin as white wash - Put it on while
warm.  And in order to have it so keep
adding the hot water as some of the lime
will settle at the bottom of the vessel,
make the mixture very thin.
        