Short Wave Radios • Dr. Lee De Forest and Gugliemo Marconi invented the Short Wave Radio in 1919. • They became know as the “Fathers of Radio.”
The Holland Tunnel • Built by Clifford M. Holland 1920 to 1927 • Cost $54,000,000 • 100,000 vehicles pass through each day • North tube 8,558 feet South tube 8,371 feet
Television • Vladmir Kosma Zworykin is know as Television’s Modern Father. • Philo Taylor Farnsworth was first to transmit a television image. The image was a dollar sign. $
Color Television • 1925- Zworykin filed a patent for color television which failed. • 1959- Color t.v. received authorization for commercial broadcasting on Jan. 22, 1959.
Helicopters • The Focke-Wulf 61 was the first practical helicopter. It solved control problems and reached 122km/h. • Juan de la Cierva’s Gyrocrafts had hinged flapping rotor blades.
Modern Helicopters • Bell AH-1Z • A modern military helicopter with a four bladed main and tail rotor and “fully integrated weapons.”