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The Cine Flash
A New Lighting Equipment for High-Speed Cinephotography and Studio Effects
BY H. K. BOURNE
MOLE-RICHARDSON (ENGLAND) LTD., LONDON, ENGLAND
AND E. J. G. BEESON
THE BRITISH THOMSON-HOUSTON Co. LTD., RUGBY, ENGLAND
SUMMARY: A new form of portable lighting equipment is described which has been designed especially to meet the needs of the high-speed cinephotographer who is always faced with the difficulty of obtaining sufficient light. Two compact-source mercury cadmium lamps are operated in series at their normal wattages of 1 kw, and are then flashed at 3, 5 or 10 kw for 5, 2 or 1 sec. The equipment consists of a control unit and two lightweight lamphouses.
The light output is sufficient for color photography at speeds up to 3000 frames/sec, or for black-and-white photography with small lens apertures to give considerable depth of focus. The flash may be triggered from a microswitch or from a camera switch. The steady light output from the lamps is sufficient to arrange and focus the subject.
METHODS OF ILLUMINATION
FOR THE SCIENTIFIC PHOTOGRAPHER the high-speed cinecamera is a valuable and potent tool enabling him to study extremely rapid motion with ease and certainty.1 Projection of the cinefilm at a low speed enables the apparent movement to be slowed down so that it can be followed by normal vision. Using this technique, or that of projection frame by frame, a detailed analysis of the motion can be made and data such as the velocity, acceleration and position of the object under observation at various instants may be obtained. To the designer of machinery in particular, the technique of high-speed cinephotography has proved invaluable; without it many of his more difficult problems would still remain unsolved. Also, in the science of ballistics many advances may be attributed directly to the use of the high-speed cinecamera.
The chief applications of high-speed cinephotography lie in the fields of science and industry.2 Modern high-speed cameras used in the majority of these applications generally operate at speeds up to 3000 frames/sec. At such speeds the exposure time is extremely short: only Ksooo sec at 3000 frames/sec. Such a short exposure PRESENTED: October 13, 1949, at the SMPE Convention in Hollywood.
SEPTEMBER 1950 JOURNAL OF THE SMPTE VOLUME 55 299