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by Science Source
$25.00
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Bottom Style
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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
Electrocardiogram taken with Einthoven's original string galvanometer, 1903. In 1901, Einthoven completed a series of prototypes of a string... more
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Spot clean or dry clean only.
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2 - 3 business days
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Electrocardiogram taken with Einthoven's original string galvanometer, 1903. In 1901, Einthoven completed a series of prototypes of a string galvanometer. This device used a very thin filament of conductive wire passing between very strong electromagnets. When a current passed through the filament, the electromagnetic field would cause the string to move. A light shining on the string would cast a shadow on a moving roll of photographic paper, forming a continuous curve showing the movement of the string. His assignment of the letters P, Q, R, S and T to the various deflections is still used. The term "Einthoven's triangle" is named for him. It refers to the imaginary inverted equilateral triangle centered on the chest and the points being the standard leads on the arms and leg. After his development of the string galvanometer, Einthoven went on to describe the electrocardiographic features of a number of cardiovascular disorders. Einthoven received the Nobel Prize in Medicine in 1924.
$25.00
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