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THE ART

OF

ELECTRO-METALLURGY

INCLUDING ALL KNOWN PROCESSES OF

ELECTRO-DEPOSITION

BY G. GORE, LL.D., F.R.S.

LONDON

LONGMANS, GREEN, AND CO.

1877

All rights reserved

75670 G6

22176

INTRODUCTION.

HAVING been asked by the publishers of the Textbooks of Science, to write a small volume on the subject of Electro-metallurgy, I have endeavoured to produce such a book as would be useful to scientific students, to practical workers in the art of electrometallurgy, gilders, platers, &c., and to all persons who wish to obtain in a compact form, an explanation of the principles and facts upon which the art of electrometallurgy is based, the circumstances under which nearly every known metal is deposited, and the special details of technical workshop manipulation in the galvano-plastic art. I have also given an historical sketch of the development of the subject, arranged in chronological order.

The book is divided essentially into four parts, viz., First, the Historical sketch, showing how from one or two isolated, and apparently unimportant facts, the great subject of Electro-chemistry arose, and by the incessant, and unremunerated labours of many

eminent scientific investigators, and the exertions of practical operators, it has gradually extended, until nearly every known metal has been separated, copper has been deposited in great quantities, and the eminently useful, and beautiful products of artistic electro-deposition, have spread nearly all over the Earth, and are to be found in every civilised home. The Second part consists of the Theoretical division, being a concise statement of the chief facts and principles upon which the practical art is based, together with descriptions of the classes of phenomena usually met with in electrolytic and electro-depositing processes; the facts and principles being arranged in as systematic and logical an order as I could place them. The Third part (section A) is the first portion of the Practical division of the book; and treats of the general methods of deposition, the selection of depositing processes, the general rules to be obeyed, and points to be observed, in actual working with all metals, followed by the special means of depositing nearly every known metal and metalloid. The metals, &c., are arranged in their ordinary chemical classes in the following order :-Electro-negative or brittle metals, noble, base, earth and alkaline earth, alkali metals, and finally the metalloids; and the arrangement is such, that every known instance of the electro-deposition of nearly every known metal, and metalloid, may be readily found and referred to. It is hoped that not only students and practical workers in the art, will find this

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