3.75 lbs.
Litharge 3.75 lbs.
Linseed oil 78. lbs.
Spirits turpentine 7.25 lbs.

The oil must be first boiled half an hour. The mixture is then boiled
twenty-four hours, poured off from the sediment, put in jugs and
corked.

3. Coal tar of good quality 2 galls.
Spirits turpentine 1 pint.

The turpentine to be added in small quantities during the application
of the lacquer.

4. Anti-corrosion 40 lbs.
Grant's black, ground in oil 4 lbs.
Red-lead, as a dryer 3 lbs.
Linseed oil 4 galls.
Spirits turpentine 1 pint.

This mixture, when well stirred and incorporated, will be fit for use;
but, as by long keeping in this state it becomes hard, no more should
be mixed than may be required for immediate use.

Anti-Corrosion.--Slag from iron
foundries, pounded 12 lbs.
Chalk 12 lbs.
Soot, common 1 lb.

In applying lacquer, the surface of the iron must be first cleaned
with a scraper and a wire brush, if necessary, and the lacquer applied
hot, in two thin coats, with a paint-brush. It is best done in summer.

Old lacquer should be removed with a scraper, or by scouring, and not
by heating the guns or balls, by which the metal is injured.

PLANTOU'S COMPOSITION FOR COATING IRON OR WOOD AS A PRESERVATIVE.

_First composition._

Pulverized rosin 3 lbs.
Pulverized shellac 2 oz.
Pulverized charcoal, or cannel-coal 1 lb.
Spirits turpentine 1 oz.

_Second composition._

Pulverized rosin 3 lbs.
Beeswax 4 oz.
Pulverized charcoal, or cannel-coal 1 lb.
Spirits turpentine 1 oz.

The first two articles are to be dissolved in an iron vessel over the
fire; the charcoal is then added, and briskly stirred until the whole
is well intermixed; after which the turpentine is added, and stirred
until it is well incorporated with the other ingredients. It is not
safely made on board ship.

The composition is to be applied when hot, with a brush or spatula,
and smoothed over with a hot iron. The wood, or iron should be
perfectly dry, and freed from rust or other lo