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others, for courtesies extended to him in making personal examination of their processes and methods; and to the last named especially for opportunities afforded, and assistance rendered, in experimental work. He is also indebted to Prof. Edwin J. Houston, of Philadelphia, for the revision of the proof-sheets of the chapter on Dynamo-Electric Machines.
To facilitate reference and investigation, a copious list of patents -American and British-relating to the subject of electro-metallurgy has been carefully compiled and is given in the Appendix. The very full index will also be appreciated by those who may have occasion to consult it.
W. H. W.
PHILADELPHIA, Nov. 5, 1883.
Small articles which cannot be Scratch-Brushed, cleaned by Attrition;
how the operation is performed
The Grenet Battery; the Marie-Davy Battery; Smee's Battery
The Léclanché Battery; this Battery less powerful than either the
Construction of the Léclanché Battery
M. Gramme's Improvement in the Dynamo-Electric Machine by using
Relative amount of work done by the Battery, and by the Electro-mag-