 |
 Microwave Oven History Part2 - Complete history of microwave technology (part 2). 1894 to 1897, including discoveries made by Gugliemo Marconi (morse code) and Sir Oliver George (directional radiation).
 Microwave Oven History - Complete history of microwave technology starting in 1873, including all influencial figures until the practical application in the 1940s of an application such as microwave ovens. First in six part series.
|
|
|
|
|
Complete history of microwave technology (part 3). Turn of the century, detailing discoveries made by J.A. Fleming (diode tube) and J.C. Bose (short electromagnetic waves).
|
Complete history of microwave technology (part3)
A lot was happening in microwaves around the previous turn of the century. J.A. Fleming, who had worked with Maxwell, Marconi, and Thomas Edison, invented an
electrical valve', better known today as a diode tube. Fleming also came up with an equation that expressed the impedance characteristics of high frequency transmission
lines in terms of measurable effects of electromagnetic waves.
Up until this point, focus had been on sending and receiving communication signals. As the new century progressed, scientists worked with longer and longer
wavelengths to achieve greater and greater distances.
In India, however, J.C. Bose was working with shorter and shorter waves. In 1895, Bose gave his first public demonstration of electromagnetic waves, using them
to ring a bell remotely and to explode some gunpowder.
The wavelengths he used ranged from 2.5 cm to five mm. He was playing at 60 GHz over one hundred years ago! Bose's investigations included measurement of refractive
index of a variety of substances. He also made dielectric lenses, oscillators, receivers, and his own 'polarization device.'
|
|
|
|
 Microwave Oven History Part4 - Complete history of microwave technology (part 4). 1911 to 1921, notable discoveries made by Heike Kamerlingh-Onnes, Jan Czochralski (semiconducter crystals) and Walter Schottky.
|
J.A. Fleming
|
|
|
J.C. Bose
|
|
|
|
Back
