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$25.00
Size
Bottom Style
Image Size
Product Details
Dress it up, dress it down, or use it to stay organized while you're on the go. Our zip pouches can do it all. They're crafted with 100% poly-poplin fabric, double-stitched at the seams for extra durability, and include a durable metal zipper for securing your valuables.
Our zip pouches are available in three different sizes and with two different bottom styles: regular and t-bottom.
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
Care Instructions
Spot clean or dry clean only.
Ships Within
2 - 3 business days
Photograph
Canvas Print
Framed Print
Art Print
Poster
Metal Print
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Wood Print
Greeting Card
iPhone Case
Throw Pillow
Duvet Cover
Shower Curtain
Tote Bag
Round Beach Towel
Zip Pouch
Beach Towel
Weekender Tote Bag
Portable Battery Charger
Bath Towel
Apparel
Coffee Mug
Spiral Notebook
Fleece Blanket
Tapestry
Jigsaw Puzzle
Sticker
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...
$25.00