Now we come to what I consider the “fun” part of this article: Granville Woods’ inventions and patents. There are some who say that the number of patents Woods obtained is at least 60, may be even ...
In the 1880s Heinrich Hertz discovered that a spark jumping between two pieces of metal emits a flash of light—rapidly oscillating electromagnetic waves—which can be picked up by an antenna. To honor ...
METHODS of transmitting pictures by telegraphy have been known for the last ten years. In a suitably constructed photoelectric cell, the electric current through it can be made proportional to the ...
Results that may be inaccessible to you are currently showing.
Hide inaccessible results