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It's the morning of October 2nd, 1925, in a building in Soho, London.

In worn beige slippers, 37-year-old John Logie Bair dashes down a narrow staircase, taking the steps two at a time and calling out for help.

At the bottom of the stairs, John crashes into William Taiton, a 20-year-old office clerk,

and sends him tumbling to the ground. Pulling William to his feet with hurried apologies,

John asks if he can come up to his laboratory at the top of the building because there's an emergency. Before William can say no, John grabs him by the arm and pulls him upstairs.

William tries to ask what the trouble is, and whether John wouldn't be better off finding

someone else, but John waves away all questions.

He flings open the door to his lap.

This converted attic is dominated by long pine work benches.

Wires, snake across the floor, and heavy electrical cabinets line the walls.

In the center of it all stands a strange machine with motors, wheels, and lamps.

In front of it is a wooden chair.

John guides William toward it.

This is the emergency.

John needs a test subject.

William glances around nervously as John moves one of the lights closer until it is just inches from William's face.

...