How to send pictures during World War II

Photo fax technology was invented in 1907.

A brief history of the fax machine

In 1850, there was another British inventor named F. Becker. He made great improvements to the structure of the fax machine. He used A "roller and screw" device replaces the structure of a clock and pendulum. This improved structure works a bit like a lathe. The drum rotates rapidly, and the artwork sent by fax is rolled on the drum. The scanning needle slowly advances along the axial direction of the drum along the screw rod, spirally scanning the graphics on the surface of the drum. This drum-type fax machine has been in use for more than a hundred years. In 1865, an Iranian named Abakarje developed a practical fax machine based on the fax machine principles and structures proposed by Bain and Bekkal, and took his fax machine to Paris, France. Cities such as Lyon and Marseille conducted experiments with fax communications. The invention of the photo fax machine People's requirements for the transmission of news photos and photographic images are very extensive. Many scientists worked on the photo fax machine. On November 8, 1907, a French inventor-Edouard Belland performed his development result-photo fax in front of everyone. Edouard Belland (1876-1963) worked in the French Photography Association building. The French Photography Association building where he was located happened to be the starting point and end point of the French telecommunications line from Paris to Lyon to Bordeaux to Paris. This provides Beland with unique conditions for his research. Belan's painstaking research obtained permission from the telecommunications department, allowing him to use this communication line for experiments at night. After three years of research and experimentation in the basement of the building, Beland finally made a photo fax machine. Edward Belland was not satisfied with his initial success and continued research on fax machines. In 1913, he built the world's first portable fax machine for news gathering. In 1914, a French newspaper first published news photos transmitted via fax machine. Photo fax changes pointer contact scanning to photoelectric scanning, which not only greatly improves the quality of fax, but also allows photoelectric scanning and photosensitive plate making to be combined to realize photo faxing. In 1925, AT&T's Bell Research Institute developed a high-quality photo fax machine. In 1926, the wired photo fax service across the continental United States was officially opened. In the same year, the wireless photo fax service across the Atlantic Ocean was also opened with the United Kingdom. Since then, European, American and Japanese countries have successively opened up the photo fax service. Since then, photo fax has been widely used by news agencies to transmit news photos, and later expanded to the military, public security and medical departments, and is used to transmit military photos, maps, criminal photos, etc. Fingerprints, X-ray photos, etc. Color Fax Machine The earliest picture of a color fax record appeared on the frontispiece of the April 1925 issue of Bell System Technical Report. This picture is actually transmitted separately three times using color filters in three colors: red, green, and blue, and then overlaid and combined. Later, someone used the same basic technology and adopted some automated operations to develop a fax device that could reproduce color pictures. In August 1945, at the Potsdam Conference, color photos of Truman, Stalin and Attlee were successfully transmitted by radio from Europe to Washington.

However, it still cannot be used to open the color fax service