156

ochres, and other mineral pig-
ments, have been tried, but with»
out anlivering the purpofes f0 well
as could be wifhed. Two compo-
fitions like-wile, recommended in
the Swedilh Tranlaciions, were
examined by our author; but he
gives the preference to the follow-
ing compoiition : the finell colour-
ed pieces ol pitcoal are to be ground
to an impalpable powder, and to
be added to the melted tar in fuch
a proportion as to be freely fpread
with the brulh while warnL-The
following curious anecdote is re-

. lated by Dr. Lewis.

“ The mixture of tar and lamp-
blaclc is found the moi’: efFectual
prefervative for the malls and yards
of lhips. Such parts of the mall,
as the Hiding up and down of the
fails requires to be only gretfed,
and tholie which are covered with
turpentine or rofin, mixed with tal-
low or oil, generally contract large
rents, while the parts coated with
tar and lamp-black remain perfect-
1y found. I have been favoured,
by a gentleman on board a vefiel
in the EaitIndies, with an account
of a violent thunder-ltorm, by
which the main-malt was greatly
damaged, and the efleeits of which
on the diPEerent parts of the mail
were pretty remarkable. All the
parts which were grealied, or co-
vered with turpentine, were burfi
in pieces: thofe above, between,
and below the greafed parts, as
allio the yard-arms, the round top,
or fcaliblding, &c. coated with tar
and lamp-black, remained all un-
hurt.

* Dr. Lewis met with the firll account of this varnifli, in a

ANNUAL REIGISTER, 1766.

Of amlier

warm/Jar fir Papier
JVIarbé, tit.
HE cuttings ofwhite or brown
_ paper, boiled in water, and
beaten in a mortar, till they are
reduced into a kind of pallc, and
then boiled with s folution of gum-
arabic or fize, form the papier ma-
c/aé. From this are made agreat
variety of toys, tiec. by prefling it
while moilt into oiled moulds.—A
black varnifh, hard, durable, and
glofTy, for coating thele toys, &c.
is thus prepared * . “ Some
colophony, or turpentine, boiled
down till it becomes black and
friable, is melted in a glazed
earthen veflel, and thrice as much
amber in fine powder fprinkled in
by degrees, with the addition of a
little ipirit or oil of turpentine now
and then ; when the amber is melt-
ed, fprinkle in the fame quantity
of farcocolla, continuing to iiir
them, and to add more fpirit of
turpentine, till the whole becomes
fluid; then firain out the clear
through a coarfe hair-bag, prefiing
it gently between hot boards. This
varnifh, mixed with ivory-black
in fine powder, is applied in a hot
room, on the dried paper-pafle,
which is then fet in a gentle heat-

ed oven, next day in a hotter oven, .

and the third day in a very hot
one, and let {land each time till
the oven is grown cold. The palle

thus varnilhed, bears liquors hot or
cold.

“ A more fimple amber varnilh
is prepared, by gently melting the

pamphlet on

Drawings, &c. printed for Mr. Peele, in 1732, and faid to be taken chiefly from

manulcripts left by Mt‘. Boyle.

amber