Journal of the Society of Motion Picture and Television Engineers (1950-1954)

film capacity operating up to 2500 frames/sec68; a 70mm camera taking 25 pictures/sec, each 2j X 5 in., or 50 pictures/sec, each 2j X 2| in.69; a 70mm X-ray motion-picture camera providing 15 frames/sec, each 2} X 2 in.70; a 70mm intermittent-action, pin-registered camera providing up to 450 frames/sec, each i X 2-J in.71; and wide-angle optics used on highspeed motion-picture cameras to provide a field of view up to 1600.35 Southard72 describes three methods used in recording the images of both 4-in. and 80-in. lenses on one roll of film so that a single radar boresight tracking camera can obtain a wide field of view during early stages of a missile's flight and a large missile image during later portions of flight. Edgerton and Germeshausen73 report refinement of a previously described74 magnetooptic shutter which permits reduction of exposure time from 4 /isec to 1 jusec. This shutter has been used extensively at the Ballistic Research Laboratory, Aberdeen Proving Ground in the study of high-velocity shock waves and flame fronts. Lipton and Saffer75 describe extensive modifications that have been made in Askania cinetheodolites by Aberdeen Proving Ground and the Naval Gun Factory. The new instruments incorporate improved bearings, data circles and mount components; a camera operating synchronously up to 64 frames/sec as contrasted to the present top rate of 4 frames/sec; 500-ft film capacity and telescopic optical systems of varying focal lengths up to 180 in. A valuable analysis of glow lamps used for high-speed camera timing purposes is provided by Ferree,76 while Erickson77 gives a general description of circuit requirements to provide timing marks in the range from 2000 to 8000 frames/sec. He also discusses increases in firing potential required when operating the NE-51 neon bulb in total dark Bondelid78 describes an improved version of a powered camera tracking mount previously described79 as used in ballistic free-flight instrumentation. The mount carries 16mm and 35mm normal and high-speed motion-picture cameras photographing through new 24-in. and 48-in. //8 refractor lenses which resolve about 200 lines/mm on their optical axes. Sensitometry of short exposures was discussed by Castle and Webb80 and by Tupper,81 indicating continued interest in reciprocity-law failure effects in shortduration exposures. Numerous applications of high-speed photography were cited during 1953. Photography of arcs and flames emitting high-intensity light was described by Stubbs, Rothschild and Moen82 and by Stern and Foster.83 Use of high-speed photography in rocket and jet propulsion studies was described by Stratton and Stehling84 and by Berman and Scharres.85 The latter paper discusses several types of American and European high-speed cameras, including the new Warrick streak cameras which transport 35mm film up to 125 ft/sec; the Acmade fullframe 35mm camera holding 200 ft of film and operating up to 2000 frames/sec ; the M.G.D. 80-lens cameras taking a total of 750 pictures at rates up to 100,000/sec; and British developments in the image converter tube field. Photography of high-voltage electrical arcs by the Bonneville Power Administration was described by Harrington and Ramberg86; Blunt87 described high-speed photographic instrumentation of large underground explosions conducted in Utah; Brown88 outlined use of high-speed flash in securing records of aerodynamic patterns in a wind tunnel using smoke trails; and Johnson89 described high-speed photographic recording in the textile and black-powder wrapping fields. Waddell90 outlined general procedures in the photography of motion; while Wilkinson and Romig91 explained the simultaneous use of several Daily: Progress Committee Report 353