Abstract
A three-stage image-converter tube is used to obtain sequences of high-speed photographs of fast low-brightness phenomena. The image converter has a light gain of 8000 ×. Mismatched coaxial cables are used to generate the deflection and shutter pulses. The framing rates range from 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</sup> /sec to 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">8</sup> /sec. Exposure times can be as large as the interframe times, or as short as 5 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-9</sup> sec. The number of frames in a sequence can be from 6 to 15. The apparatus has been used to study electric discharges in vacuo when nondestructive current pulses are passed through fine metallic wires. Examples of the recorded sequences of pictures are presented.
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