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]

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ARTIFICIAL Gems in imitation of
oriental pearls — - 269

--to prepare mercury-water ; to f jrm

large pearls out of (mall ones — 271

-to imitate precious itones, &c. 272

-parte or imitating an oriental

topaz - - - 273

- an artificial chryl'olite ; a diamond

or a ruby - -274

-to polifh gems — — 276

-of counter-drawing camieaus. in-

talios, and other gems preferved in
the feveral muleums of Europe 277
BRONZING ; colouring bulls and figures

to reprelent copper — - 222

—— prccels to prepare the metaline
powder ; eafy method to produce gold
powder, and aurum moiaicum 223

-argentum mulivum ; bronzing by

loft leather infteadof cement — 224

-gold fize the belt binding ; filver

bronzing by means ofmufivum argen-
tum — — - 22C

CASTING; to prepare clay for moulds
to calt gold, filver, S:c. in •— 202

■-to make moulds of clav to call:

bral's ; moulds which need not be

heated to call metal in - 203

-preparation of Mantua earth for

moulds ; a particular fort of mould
to call exceedingly fine ; to imprefs
bafs relievo, on medals, in imitation

of ivory - - 204

-toimprefs medals and other things

in bafs relievo on paper ; to call vege-
tables in moulds particularly prepared

for filver - — 20;

-to call all forts of things in gold,

fdver, or other metals - 206

-to caft v egetables and infects 207

-to place inlects, &lc. to call from 208

-a Cmple plain method to cad vege-
tables or infects in another manner 209

-to call figures in brimflone ; all

kinds of fmall birds, frogs, fiih, (Jtc. :io
-how to caft fmall fnot; calling an

image or animal in plailter -211

-to call wax, medals, iStc. in bais

relievo - - 212

-how to call them like jafpis ib.

-to caltfiih, reptiles, fruit, &c. in a

pewter plate, or dim — - 213

— figures in Laiitauoji of ivory 214

E X.

CASTING, with marble colours in plan-
ter ; a fand to call with nicety 215

-to call horn and wood in moulds,

as fine as ivory, and of a fragrant

feell - - _ _ 2S4

-mixture for catlipg mirrors, and

other things fjr opticks - 217

-another, anfwering the fame pur-

pofes — — — — 2:8

-a third fort of fteel mixture for

mirrors —— - 219

-to call iron, fteel, and prepare

. arfenic glafs — —— - 220

-to call iron as white as filver ; to

call plaiiter of Paris on copper 221

- a mixture f ;r impreffions of any

kind, which will become as hard as

ftone - - —— 222

-to imprefs figures in imitation of

porcelain - - ib.

COLOURS, method of preparing the
different kinds ufed in painting 43
Clafs L RED.

-fcarlet, or tending to orange 44

-crimfon, or tending; to purple ib.

-verm'liion, its qualities —— ib.

-procefs for preparing vermillion

to great perfection — — 45

-means to detect dealers who lo-

phitlicate vermillion with red lead 46

-native cinnabar, red lead or mi-

num, fcarlet oker, and their ufes 47

-prepartion of icarlct o'er — 48

-common Indian red, its ufe and

preparation - — 40

-Venetian red — - ib.

-Spanifh brown - — 50

-calcined or burnt terra di flenna ib.

-carmine - —--ib.

-lake, manner of extracting it 51

-role pink, and its prepartion 53

-red oker — - -54

Clafs II. B L U E.

-ultramarine — - 54

-bed modern method of preparing

the ultramarine pigment — 55

-its properties and bad confequence

if adulterated - — 57

-ultramarine allies, and how to pre-
pare them — — — 58

-PrutTian blue and preparation 59

-verditer — -■ 61

— bleu de Ceildre , or Sanders blue 62
o COLOURS;
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