On This Day in Telephone History August 18TH 1917 Successful demonstration of two-way air to ground transmissions. This was the third of four demonstrations of various transmission methods which were conducted by radio experts. It took three months, working day and night in Western Electric's New York Laboratory and Model Shop, to adapt the equipment for routine use by pilots. The experiments involved the use of the world's first mass-produced Vacuum Tube (VT-1), which was developed by Western Electric.

On This Day in Telephone History August 18TH 1917

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On This Day in Telephone History August 18TH 1917 Successful demonstration of Two-Way Air to Ground Transmissions. This was the third of four demonstrations of various transmission methods which were conducted by radio experts. It took three months, working day and night in Western Electric’s New York Laboratory and Model Shop, to adapt the equipment for routine use by pilots. The experiments involved the use of the world’s first mass-produced Vacuum Tube (VT-1), which was developed by Western Electric.

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