thumb|right|A Fultograph image, 65×129mm.
thumb|right|A Fultograph image, 65×129mm.
The fultograph (pronounced like "photograph") was an early, clockwork image-receiving device, similar in function to fax machines. It took signals from the loudspeaker socket of a radio receiver and used an electrochemical process to darken areas of sensitised paper wrapped on a rotating drum. Invented by Otho Fulton, the system was used briefly in the late 1920s to broadcast images to homes by radio. The machines themselves were expensive (£22 15s 0d in 1928) and required a good receiver to operate.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).