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$15.00
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Our spiral notebooks are 6" x 8" in size and include 120 pages which are lined on both sides. The artwork is printed on the front cover which is made of thick paper stock, and the back cover is medium gray in color. The inside of the back cover includes a pocket for storing extra paper and pens.
Design Details
Detail of a rendering of Mayer's Topophone that appeared in the July 3, 1880 issue of Scientific American. The aim of the topophone, which was... more
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Detail of a rendering of Mayer's Topophone that appeared in the July 3, 1880 issue of Scientific American. The aim of the topophone, which was invented and patented by Professor A. M. Mayer, last winter, is to enable the user to determine quickly and surely the exact direction and position of any source of sound. The topophone consists of two resonators (or any other sound receivers) attached to a connecting bar or shoulder rest. The sound receivers are joined by flexible tubes, which unite for part of their length, and from which ear tubes proceed. One tube, it will be observed, carries a telescopic device by which its length can be varied. When the two resonators face the direction whence a sound comes, so as to receive simultaneously the same sonorous impulse, and are joined by tubes of equal length, the sound waves received from them will necessarily re-enforce each other and the sound will be augmented. If, on the contrary, the resonators being in the same position as regards the...
$15.00
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