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Science Tote Bag featuring the photograph Prototype Fleming Valves, 1904 by Science Source

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Prototype Fleming Valves, 1904 Tote Bag

Science Source

by Science Source

$33.00

Size

Image Size

 
 

Product Details

Purchase a tote bag featuring the photograph "Prototype Fleming Valves, 1904" by Science Source.   Our tote bags are made from soft, durable, poly-poplin fabric and include a 1" black strap for easy carrying on your shoulder.   All seams are double-stitched for added durability.   Each tote bag is machine-washable in cold water and is printed on both sides using the same image.

Design Details

The first prototype Fleming valves. The Fleming valve, invented in 1904 by John Ambrose Fleming, as a detector for radio waves in early radio... more

Ships Within

2 - 3 business days

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Prototype Fleming Valves, 1904 Photograph by Science Source

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Tote Bag Tags

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Photograph Tags

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Artist's Description

The first prototype Fleming valves. The Fleming valve, invented in 1904 by John Ambrose Fleming, as a detector for radio waves in early radio receivers, was the first thermionic diode and the first vacuum tube. The basic configuration consisted of an evacuated glass bulb containing two electrodes a cathode in the form of a wire filament heated white-hot by a current through it, and a metal anode usually consisting of a flat plate. Since only the filament produces electrons, the current of electrons through the tube can only pass in one direction, from filament to anode. In these early tubes, the filament is the vertical loop of wire, while the anode has various shapes, such as the coil of wire in the lefthand tube. The caption says "Photograph of the oscillation valves first employed by Dr. J. A. Fleming, FRS, in October 1904, for the rectification of high-frequency electric oscillations as used in wireless telegraphy".

 

$33.00