Colby during its progress introduced electrotyping, contour lines on the six-inch maps, and the training of picked men of the sappers and miners as surveyors.
22.
In this application, electrotyping was a higher quality but more costly alternative to stereotyping, which involved casting of type metal into a mold prepared from the forme.
23.
Electrotyping is activated by electric currents that flow between anode wires that are also immersed in the solution and the wire connected to the coated mold ( the cathode ).
24.
An important example of electrotyping's use for preservation is the electrotype of the plaster life-mask of the poet John Keats ( see photograph E below ).
25.
There is a second type of electrotyping that has been used in which the copper film is deposited onto the outside of a form, and is not separated from it.
26.
As noted above, electrotyping forms the part using a non-conducting mold or form whose surface has been made conducting by applying a thin coating of graphite or metal powder.
27.
Electrotyping was used for general purpose type manufacture in the nineteenth century, but was a somewhat disreputable process, leading to some typefounders disdaining it ( or at least claiming to ).
28.
The term " bronze " is also applied to metal sculptures made by electrotyping ( or galvanoplasty ), although these sculptures are typically pure copper and their fabrication does not involve metal casting.
29.
For copper electrotyping, a typical aqueous electrolyte contains copper sulfate ( CuSO 4 ) and sulfuric acid ( H 2 SO 4 ), and the anode is also copper; the arrangement is illustrated in the figure.
30.
The electrotyping industry was limited for some decades by the sources of the electric currents needed to activate the deposition of metal films into the mold; the rate of film growth is proportional to the magnitude of this current.
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