Master Timeline

In 1908, students at Columbia University formed the Wireless Telegraph Club of Columbia University, which is now known as the Columbia University Amateur Radio Club (ARC). This organization was established to provide a platform for students interested in the emerging field of wireless telegraphy to experiment, learn, and share knowledge. The club played a crucial…

In 1906, Dr. Lee De Forest presented his invention of the electrical vacuum tube, which he called the Audion. This groundbreaking device was the first triode, consisting of three elements: a cathode, an anode, and a control grid. The Audion could amplify electrical signals, which was a significant advancement over the earlier two-element vacuum diodes…

The famous equation E=mc² was formulated by Albert Einstein as part of his Special Theory of Relativity, published in 1905. This equation expresses the relationship between energy (E) and mass (m), with “c” representing the speed of light in a vacuum (approximately 299,792,458 meters per second). The equation demonstrates that mass can be converted into…

In the early 20th century, Graynella Packer served as a wireless operator for the United Wireless Telegraph Company aboard the steamship Mohawk along the U.S. Atlantic seaboard. As one of the few women in a predominantly male field, Packer’s role was pioneering and significant. She was responsible for managing wireless communications, including sending and receiving…

In 1904, Horace G. Martin invented the first Vibroplex, a semi-automatic key, also known as a “bug,” which revolutionized telegraphy. The Vibroplex allowed operators to send Morse code at higher speeds with greater ease and accuracy than traditional straight keys. The device used a vibrating arm to automatically produce a series of dots, while the…

In 1904, English physicist John Ambrose Fleming developed the first vacuum diode, known as the Fleming Valve. This invention was a crucial advancement in the field of electronics and radio technology. The Fleming Valve was a two-electrode vacuum tube that allowed current to flow in only one direction, effectively acting as a rectifier. It was…

In 1904, the Marconi Company established “CQD” as the first international radio distress signal. The signal “CQD” was derived from the general call “CQ,” used to alert all stations, with the addition of “D” to signify “distress.” This signal was intended to be universally recognized by ships and shore stations equipped with wireless telegraphy, ensuring…

In 1904, Medora Olive Newell, an American wireless telegraph operator, made history by stepping in as an operator on a trans-Atlantic voyage. She worked for the Marconi Wireless Telegraph Company and became one of the first women to operate a wireless telegraph on a major transatlantic route. During her service, she demonstrated her technical proficiency…

In 1903, the first U.S. commercially built wireless telegraphy transmitters and receivers were produced by the American branch of the Marconi Wireless Telegraph Company of America. These early commercial units were based on the pioneering work of Guglielmo Marconi and represented significant advancements in the practical application of wireless communication technology. The equipment was used…