I N D E X.
Graatiation or gild and silver —148, 161
Grates for portable furnaces, of a new con-struction -613
Gravity, specific, of metals, difficulty ofdetermining with ertactneis — 55 +cautions in the weighing — 42. 543
variations produced by heat-—42
Method of computing the gravities ofmixts from those of their ingredients
--— 12;. 541
Mistakes in this computation 545, 556Method of computing the gravity ofingredients from that of mixts 454Variation of gravity from mixture, in
metals- 547> 55 3
in iiquids — — —- 557
Two metals contracted by mixture intoless volume than one of them occu-pied separately —--- 5 5 1 » 55^
Tables of the gravities of mixtures ofplatina with different metals 346,/fy.
Grey, a mixture of white and. black 3 r 9Produced from blue, red and yellowed
Method of dying-«--4.13
Produced in painting with black pig-ments diluted -T- —--319
Gunpowder, its force compared with thatof aurum fulminans —-.— 106
Gypsum, melted by a burning glass — 465Promotes the fusion of iron 502., 534
Mixed with water, expands in becoming
solid —- 239
Its uses in consequence of this property
II.
Hair stained black — — —— 43;
Hats, method of dying black-428
Heat, means of communicating an equalone to different subjects —, 31, 32Produced by the mixture of two coldliquors-13^
Horn stained black--1-.—.— 435
I.
He, lighter than water — 257
Becomes still lighter from a continuanceof cold — — — — — — 23KArrangement of its parts-258
Impressions from medals, &c. matters for
taking —-33Z. 3 54 - 44 2
Matter for making seals from impressionsin wax-7 6
Ink, Indian, its analysis-358
Imitation of it--- 3 59
Plow said to be made in China — 638
Ink, printing, its preparation --37 1
Ink for the rolling-press, its preparation^^Differences from printing ink- 3"6
Inks, sympathetic, made visible by fire 31 8by passing a liquor over the writing 353.by exposure to fumes---353
Ink, Mack writing, with vitriol and astrin-
Fhenomena of the production of the co-lour -34b
Properties of the colouring matter 347
Analogy with Prussian blue --348
Experiments for determining its best
preparation- 362
Composition of ink deduced from the
experiments —,-392
Causes of its fading or changing colour
— --r 380,384
Its colour discharged —--349.
Improved by keeping-386
Injured by some metalline vessels— 390
Made to write black at once ~r-392
Duration of writings prolonged by pie-
paration of the paper —r-.-393
Ink from more durable materials —396Ink of the ancie.nts^- — - -399,334
Iron, brought into fusion by gypsum 502,
--- 534
Malleable after fusion-534
Melted with gold->-- 82, 85
Melted, with platina-534, 552
Improved by platina —-- 536
Soldered by gold —-82
Amalgamation of it with mercury 508Experiments of its expansion in fixing
— ---. — —261
Increase of weight in calcination— 552Variations in its gravity from its having
more or less phlogiston — —552Colours