I N D
I'anijbn, Black, (or metals — 369, 639
of China and Japan-329
a similar one from plants raited here
-330
Brown for metals —-639
Gold coloured-223, 624.
Printers, ink for-— 372
Vegetations of metals in the cupel — 260from metallic solutions, on stones 440
Verdigris, improves the black dye 407,
-411, 429
Debases black ink — —-389
Produces blue and black with logwood
-_ — —- 4°7
Precipitation of gold by it — — 109
Verditer, its preparation-151
Vessels, glass, made harder and more ca-pable of bearing fire, by baking — 240
Vitriol, green, how prepared in England
- 34;
Whether English or foreign preferable
in dying-— 428
Marks of its goodness-409
Phenomena on mixing it with astrin-gents — —- 346
Calcination of —-— 1 35
Its use iu purifying gold-109
Vitriolic acid, how distinguished in liquids
_— —-640
Purification of liquids from it — 640
Uva urfi, as an astringent in dying 416,418Differences from other astringents 418
W.
Wait - 3 2 S
Watts, its bulk increased in freezing 257,
- 2,3
Mark of small degrees of alcalescence or
putrefaction in it —- 346
Its vapour does not animate fire — 21Weight of a cubic inch of it — — 43Its expence through different apertures
at different depths-— 279
Runs faster through an upright long than
short pipe — -— 632
Carries air down with it in falling
through pipes —-291, fiq.
.Account of blowing machines on this
principle —-270
Experiments for their improvement 279
E X.
Wax, gilding — — 78
Black sealing— — —-370
Weights, small ones how obttined exact
-— — 544
Willow, its excellence for charcoal cray onswhence-337
Wire, gold or gilt-31
Process of gilding and drawing the wire
----53
Method of flatting it-57
Method of spinning the flatted wire on
thread-—-71
Observations on the fineness of the gold
used for it-5 l
Proportion of the gold to the silver 53Calculation of the thinness of the golden
coat-59
The silver extracted, so as to leave a tube
of gold-60
Wire gilt only on one side — — — 61Colour of the gilding altered by heat 56Method of nealing the wire — 55, 56wire from platina and gold-326
'Wire-drawing plates, of steel — — 53Of Lyons metal, their qualities — 54Iron the basis of the Lyons metal — 54
Wood, stained black-434
Stained purple — — — —-- 97
Composition for preserving — — 362In some cases damaged by painting 365
Wool, method of cleansing from its natural
grease — —-415
of dying black-41;
Woollen doth, process of dying black 410
of dying grey-— 413
stained purple-97
Writing black with colourless liquors 395Sympathetic, fee inkgtlt letters — —- —-64
Z.
Zaffre, eolours it gives to glass — 441Mark for distinguishing the minerals fitfor making it —■ — —--343
Zinc, way of extracting pure from its ore,
and combining with metals-519
Melted with platina --— 520
with gold —- — — — — 85, 87
e-
FINIS.