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by Science Source
$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
Alexander Graham Bell is commonly credited as the inventor of the first practical telephone. He was the first to obtain a patent, in 1876, for an... more
Care Instructions
Spot clean or dry clean only.
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2 - 3 business days
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Alexander Graham Bell is commonly credited as the inventor of the first practical telephone. He was the first to obtain a patent, in 1876, for an "apparatus for transmitting vocal or other sounds telegraphically", after experimenting with many primitive sound transmitters and receivers. Bell's telephone transmitter (microphone) consisted of a single permanently magnetized bar magnet having a small coil or bobbin of fine wire surrounding one pole, in front of which a thin disc of iron was fixed in a circular mouthpiece. The disc served as a combined diaphragm and armature. On speaking into the mouthpiece, the iron diaphragm vibrated with the voice in the magnetic field of the bar-magnet pole, and thereby caused undulatory currents in the coil. These currents, after traveling through the wire to the distant receiver, were received in an identical apparatus. This design was patented by Bell on January 30, 1877.
$25.00
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