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by Science Source
$93.00
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Product Details
Our shower curtains are made from 100% polyester fabric and include 12 holes at the top of the curtain for simple hanging from your own shower curtain rings. The total dimensions of each shower curtain are 71" wide x 74" tall.
Design Details
The essential elements of a telephone are a microphone (transmitter) to speak into and an earphone (receiver) which reproduces the voice of the... more
Ships Within
2 - 3 business days
Photograph
Canvas Print
Framed Print
Art Print
Poster
Metal Print
Acrylic Print
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
The essential elements of a telephone are a microphone (transmitter) to speak into and an earphone (receiver) which reproduces the voice of the distant person. The photophone (later given the alternate name radiophone) was similar to a contemporary telephone, except that it used modulated light as a means of wireless transmission while the telephone relied on modulated electricity carried over a conductive wire circuit. It was invented jointly by Alexander Graham Bell and his assistant Charles Sumner Tainter on February 19, 1880. Bell believed the photophone was his most important invention. Of the 18 patents granted in Bell's name alone, and the 12 he shared with his collaborators, four were for the photophone, which Bell referred to as his "greatest achievement", telling a reporter shortly before his death that the photophone was "the greatest invention (I have) ever made, greater than the telephone". The master patent for the photophone was issued in December 1880, many decades befo...
$93.00
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