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The Artist's Assistant, In the Study and Practice of Mechanical Sciences: Calculated for the Improvement of Genius. Illustrated with Copper-Plates — Birmingham, [ca. 1785]

DOI Page / Citation link:
https://doi.org/10.11588/diglit.19571#0285
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THE ARTIST's ASSISTANT. 271

js very excellent, and well worth the trouble, fince
by experimenting fo fine a fecret, you will have the
fatisfaction of feeing the performance anfwer the di-
rection above expected.

Mercury-water is thus prepared : —" Take plate tin
" of Cornwall, calcine it, and let the calx be pure
" and fine ; then with one ounce of the calx, and
" two ounces of prepared mercury, make an amal-
" gama ; wafh it with fair water, till the water re-
61 mains infipig and clear; then dry the amalgama
t: thoroughly, put it into a matrafs over a furnace,
" giving it fuch a heat as is requifite for fublimation.
" When the matter is well fublimated, take off the
(: matrafs and let it cool : take out that fublimate,
" add an ounce of Venice fublimate to it, and grind
"it together on a marble; put this into another
" matrafs, clofe it, and fet it upfide down in a pail
" of water; and the whole mafs will diffolve itfeli
{t in a little time into mercury-water : this done,
ii filter it into a glafs receiver, fet it on a gentle afh
il fire to coagulate, and it will turn into a cryftalhne
" fubftance ; this beat in a glafs mortar with a glafs
<{ pefhle to a fine powder, fearce it through a fine
i- fieve, and put it into a matrafs, flop it clofe up,
'5 and place it in balneum marias ; there let it re-
tl main till it diffolves again into water, which is
" the mercury-water, fit for the above mentioned
« ufe." *

To form large pearls of fmall ones, as directed by
Korndorffer :—Take of mercurial water 14 ounces;
put two ounces fulph. folis into a low matrafs, pour
the mercurial water upon it, and let it diffolve and
extra6t ; then take of the whiteft fmall pearls 20
ounces, put them into a proper matrafs, and pour

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