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Smith, G. / The laboratory; or, School of arts: containing a large collection of valuable secrets, experiments, and manual operations in arts and manufactures, highly useful to gilders, jewellers, enamellers, goldsmiths, dyers, cutlers, pewterers, joiners, japanners, book-binders, plasterers, artists, and to the workers in metals in general; and in plaster of paris, wood, ivory, bone, horn, and other materials
(1799)
[Part IV.] The art of painting upon glass, pp. 179-187
Page 179
R{T OF PAINTING UPON GLASs. 1/79
First put the lead and tin into fusion; then put in the
bismuth; and when you perceive that in fusion too, let it
std till it is a st cold, and pour the quicksilver into it.
Afer tis, iake the glass globe, which must be very
tlean, and the inside free from dust; make a paper funnel,
and put it in the holo of the globe, as near to the glass
as you can tatt t amalgam when you pour it in, may
iot splash and cause the glass to be full of spots ; pour it
genty e it about, so that the amalgam may touch
every where. If you find the amalgam begin to be curdly,
anto befixed, hold it ovr a gentle heat, and it will flow
ely agai If you find the amalgam too thin; add a little
more 4 tin, ad bismuth fo it. The finer and clearer
'our glbe is, the better will be the looking-glass.
tE A T OF PAINTING UPON GLASS.
T noble art being the admiration of all who have
any toletrale tWe of designing or painting, it will not be
improper to give the ingehious enquirer after this mys-
iery some few hintS, not only to satisfy his curiosity
with its nature, but also, if he be inclined, to lead MIm
into the pracie of it ; which ve shall do in the plainest
and slortest manner possible.
First then, chuse such panes of glass a are clear, even,
and smooth.
" . Strike one side of each pane with a dean spunge, or
a soft hair pencil, dipt in gum-water, all over.
3. When it is dry, lay the clean side of the glass on the
outlined design you intend to copy, and with a small
pointed pencil (furnished with black colour, and prepared
for that purpose, as shall be directed) delineate the out-
lies, or capital Strokes; and where the shades appear
soft, work them by dotting, and easy strokes, onle into
anot.ifr.
N 2 4. After
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