Number 1519 Connecticut Avenue lies just north of Dupont Circle, just over a 20-minute walk from the White House in Washington, DC. In 1921, the inventor Charles Francis Jenkins set up his laboratory and offices there, upstairs from a car dealership.
Today there are no obvious external indications of this famous resident, nor of his exceptional achievements, awards and numerous patents. A hundred years ago at his laboratory, on June 13 1925, Jenkins gave a demonstration of a televised film sent by radio waves from a building 10km away at what is now the US Naval Research Laboratory in Bellevue, DC.
The invited group of mostly government officials included the secretary of the navy, Curtis D. Wilbur. They watched with fascination a film that showed a silhouette of a toy windmill with its blades in motion. The television picture comprised 48 lines, refreshed at the silent-movie rate of 16 per second.
