Important: Safety Warning
This page describes trade processes that use dangerously toxic materials such as cyanide solutions, mercury amalgams, or strong acids. These processes require training, equipment, and precautions far beyond what the text describes.
This information has been left in for historical purposes but should not be acted upon.
Electrotyping
To Amalgamate Zinc
Immerse a plate or strip of zinc of the required size in diluted sulphuric acid, for a few moments; then rub quicksilver over the surface…
Decomposing Cell
This is a vessel of suitable shape and dimensions, con- cell (see No. 3334), and is the receptacle or taining the plating or electrotyping…
Electrotyping with a Battery
For this purpose a Smee's battery (sce No. 3667) is usually employed, in connection with a decomposing cell. (See No. 3664.) As the method…
To Take Moulds in Plaster
If a plaster of Paris mould is to be taken from the metallic medal, the preparation of the medal is the same as described in No. 3676; and…
Copper Moulds from Plaster
Many electro-metallurgists prefer taking a mould in copper when the medal is of plaster of Paris. This is done by the electrotype process…
To Mould Figures in Paste
Take the crumbs of a new drawn white loaf, mould it until it becomes as close as wax, and very pliable; beat it, and roll it with a…
To Take Moulds of Figures
If the model or figure be composed of plaster of Paris, a mould is often taken in copper by deposition. The figure is saturated with wax…
To Coat Figures with Copper
When plaster busts or figures are wanted in copper, the usual way is to prepare the figure moisten it thoroughly; this is put into a me…
To Use Metal Moulds
The mould in fusible alloy does not require to be together, and boil the cast until it will not black-leaded, but the surface to be…