Acetate of copper, 125, 539, 540

of lead, 540

Acetates formed by double decomposi-
tion, effects of, 125

Acetic acid, 540

Acid baths, 444, 445

mixture for bright dipping, 35-37
for dead dipping, 38, 39

nitrate of mercury, 566
Acids, 542

poisoning by, 611, 612

spent, utilization of, 417-419
Action, bringing batteries into, 80, 81
Adams, Isaac, Jr., patent of, for an im-
provement in the electro-deposition
of nickel, 372-376

Adams, Isaac, Jr., nickel solution, 380
patent of, for the use of a solu-
tion of sulphite of nickel in
a solution of sulphite or bi-
sulphite of ammonium, 375
patents for nickel-plating, remarks
on, 375, 376

Adams, Joseph A., early reproduction
by, of an engraving by electro-me-
tallurgy, 21

Adams's process for applying powdered

tin to wax moulds, 455

Aluminium and nickel alloy of, 402
bronzes, depositing, 401, 402
deposition of, 401, 402

not advantageous as an electro-de-
posit, 401

Alu-ni, an alloy of aluminium and nickel,
402

Amalgamated articles, which have be-
come oxidized, cleaning, 319
Amalgamating salt, 443

salt, preparation of, 588

salt, Roseleur's, 80, 587, 588
Amalgam, gilding with, 242-244
gold, 559

gold, gilding with, 183-185
of gold, preparing, 239
Amalgams, 559, 560

Amateurs, silvering bath for, 309, 310
simplified apparatus for, 433-485
American experimentalists, early, in
electro-metallurgy, 21
Ammonia, 560-562

how obtained, 561
hydrocyanate of, 579
prussiate of, 579
sulphydrate of, 592

uses of in electro-metallurgy, 561,
562

supplanted by the machine in elec-
tro-plating, 113

testing working condition of, be-
fore using, 80, 81

the best, in what it consists, 70
Batteries, box or closet for, 84, 85
bringing into action, 80, 81
deriving their action from chemical
processes, 70

description of the most important
of, 70-93

electro-motive force of various, 83
galvanic, 68-93

important observations on, 84, 85
manipulation of, difficulties in, 103
should be kept separate from the
operating room, 85
taken apart, 84

temperature of place where kept,
84

the two classes of, 69, 70
Baumé hydrometer, 597

Becquerel, early paper of, on the elec-
tro-chemical reduction of nickel,

372

gilding solutions, 219

lead solution for metallo-chromes,
408

on the useful application of metallo-
chromes, 406

Bells for clocks, 556
Benzine, 583, 584
Benzole, 583, 584

as a solvent, 583

characteristics of, 583

Bertrand, description of the double chlo-
ride of palladium and ammonium, 363

simple immersion gilding with,
179-181

Bicarbonates of potassium and sodium
for gilding, 179, 180
Binoxalate of potassium, 568, 569
Bird, Dr. Golding, decomposition and
deposition of the chlorides of so-
dium, potassium, and ammonium by,
with the battery, 18

Bismuth, deposition of, 405
Bisulphide of carbon, 593

apparatus for manufacturing,
594, 595

for bright silvering, 304

Bisulphite of sodium, 591, 592

for silvering, preparation of,
280-282

Bitartrate of potassium, 569

characteristics of, 569

Black bronze, 534, 616

coloration on brass instruments.
616

lead, 453, 586, 587

for electrotyping, 483

Black-leading, dry and wet, 484
machine, 483, 484

moulds, Knight's process, 457
the mould in electrotyping,
482-485

Black on brass, 616

Blake, Prof. W. P., on Fleitmann's pro-
cess of refining nickel, 360
Bloxam's "Metals," quoted, 517, 530
Bluestone, 588, 589,
Blue vitriol, 588, 589

Boettger, Dr. R., early experiments
of, in plating with nickel, 370, 371
Boettger, Prof., successful experiments
in copying a copper,
plate for printing. 20
in obtaining relief plates
of copper, and in gild
ing silver, copper, and
brass, 20

Boettger's iron bath, 400

nickel-plating solutions, 382
process for coating articles of cop-
per or brass with zinc by immer-
sion, 397

process for platinizing, 360, 361
Bohemia, early practice of tinning in,

513

Boiler for brassing iron and zinc wire
in coils, 131, 132
Boiling pans, 599, 600
Boracic acid, 543, 544
Borax, 543, 569, 570

characteristics of, 569, 570
preparation and uses of, 570
Boric acid, 543, 544

Boulogne silver, cleansing, 65
Brass and copper trinkets, gilding by
simple immersion, 182

baths and apparatus, disposition
of, 131

disposition of, 140

copper and German silver, Rose-
leur's method for electro-silver-
ing, 315-318

deposit, light colored, bath for, 145,
146

deposits, frequently used in the
arts, 130

preferred for small articles of
iron and zinc, 130

preliminary and finishing
operations for, 131

electro-deposition of, 130-149

for articles worked with the ham-
mer, 555

for turning, 556

green bronze for, 615, 616

hints on coating different articles
with, 148, 149

solder, filling galvanoplastic copies
with, 504

statuary, 556

surface, bronzing, 131

thin coating with tin, 152
tinning, 156

Brassing, anodes in, 139, 140
articles which are subjected to,
130

bath, Bacco's, 145

cold for all metals, 134, 135
maintaining the proper
equilibrium of, 136, 137
correcting the color when too
dark, 145

when too light, 145
effects of arsenious acid in,

135
electro, Morris and Johnson's
process, 144, 145

disturbed equili

brium of, 137

tanks for, 135, 136

restoring, 137

formulæ for, 134, 148
maintaining the uniformity of
color of the deposit in, 139
varying the shades from red
to green, 138, 139

electro, and bronzing, 140

De la Salzede's process, 142
Gore's process for, 144

heat seldom employed in, 131
of zine, tin, copper, iron, and
steel, Winckler's process,
141

Walters's process, 144

Watt's process for, 143

iron and zinc wire in coils, 131-133
modifying the deposits in, 139
objects for, cleansing, 137, 138

for, scratch-brushing, 137, 138
of articles of bronze composition,
131

of zinc and iron, permanent, 140
remedying a reddish deposit in, 139
white deposits in, 139
solution, Newton's, 146
solutions, Hess's plan for regulat-
ing, 147

to keep in working order, 148
where a bronze lustre is afterwards
to be given, 140

Braun's gilding solution, 217, 218
solution for gilding zinc, 183

Breaking circuit, mechanical devices
for, 322

Briant's gilding solution, 217

Bright dipping, acid mixture for, 35-37,
aqua fortis for, 35

silver-plated articles, rinsing, 308
silvering, 304–308

anode, 146

articles, scratch-brushing, 51
black, 534, 616
brown, 616
coated zinc, 63
composition, 244
copper bath for, 120
for cymbals, 557

for electrotypes, 616

1

for gongs, 557