USEFUL ENGINEERING BOOKS

Manufacturers, Agriculturists, Chemists, Engineers, Mechanics,
Builders, men of leisure, and professional men, of all classes, need
good books in the line of their respective callings. Our post office
department permits the transmission of books through the mails at very
small cost. A comprehensive catalogue of useful books by different
authors, on more than fifty different subjects, has recently been
published, for free circulation, at the office of this paper. Subjects
classified with names of author. Persons desiring a copy have only to
ask for it, and it will be mailed to them. Address,

MUNN & CO., 361 BROADWAY, NEW YORK.

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PATENTS.

In connection with the Scientific American, Messrs. MUNN & Co. are
solicitors of American and Foreign Patents, have had 42 years'
experience, and now have the largest establishment in the world.
Patents are obtained on the best terms.

A special notice is made in the Scientific American of all inventions
patented through this Agency, with the name and residence of the
Patentee. By the immense circulation thus given, public attention is
directed to the merits of the new patent, and sales or introduction
often easily effected.