PREFACE. 



THE Author of the following Treatise was engaged for several years in 

 the application of Electro-Metallurgy to the purposes of Manufacture. 

 His operations were performed with solutions of all the metals, and 

 upon objects of every size and form. They commenced when the 

 art was young, when its practical applications were speculative, 

 its advantages and disadvantages equally unknown, when difficulties 

 of all kinds, such as beset every new art, had to be met, and con- 

 sidered, and overcome. 



The course of his daily proceedings threw him into the way of 

 observations, much more extensive and much more diversified, than 

 could possibly have occurred to any amateur of the art. Where 

 large operations in an extensive business were concerned, it was 

 necessary to attend to details that some would have considered 

 trifling, and to overcome obstacles that others might have deemed 

 insurmountable. Under the pressure of these circumstances, all 

 means were employed to procure information. Innumerable electro- 

 type processes were repeated as soon as they were published, and 

 original experiments were made in a variety of forms, and frequently 

 on an extensive scale, with a view to the removal of particular 

 difficulties, or to find the means of accomplishing certain desirable 

 ends. 



These proceedings and inquiries afforded numerous Eesults, not 

 only useful in the Manufacture in which the author was engaged, 

 but interesting to the man of Science. And it is because of their 

 general utility to all persons engaged in the multifarious processes 



