Finally he gave up. He swung the tractor into a small gulley between sand dunes, left the motor idling and pulled down the shades the villagers used for blackout traveling. There was power enough for the mike here, and the cab was big enough for what he had to do.
He mounted the mike on the tractor seat and began laying out the collection of smears and cultures he had brought. It had been years since he’d made a film for the electron mike, but he found it all came back to him as he worked.
His hands were sweating with tension as he inserted the first film into the chamber. He had the magnetic “lenses” set for twenty thousand power, but a quick glance showed it was too weak. He raised the power to fifty thousand.
The filaments were there, clear and distinct.
He turned on the little tape
