HOW TO MAKE A PHONOGRAPH.
Full Instructions, with Eight Working Drawings, Half Size. Construction easy and Inexpensive. These drawings are from an actual working Phonograph; they show the sizes, forms, and arrangement of all the parts. The explanations are so plain and practical as to enable any intelligent person to construct and put a Phonograph in successful operation in a very short time. Contained in Scientific American Supplement No. 133. Price 10 cents. To be had at this office and of all newsdealers.
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PERFECT
NEWSPAPER FILE
The Koch Patent File, for preserving newspapers, magazines, and pamphlets, has been recently improved and price reduced. Subscribers to the Scientific American and Scientific American Supplement can be supplied for the low price of $1.50 by mail, or $1.25 at the office of this paper. Heavy board sides; inscription "SCIENTIFIC AMERICAN," in gilt. Necessary for every one who wishes to preserve the paper.