SUORET HURON) Project 15.2 = High spew Photography - Time Interval Measurement -G, Felt . L. Allen The decision to fire «oi (Huron) at Fniwetok Atoll made it necessary for Program 23 (UCRL) to perform the high speed photographic time interval measurement. 2301. The observations were made from Station Seven Model 190 streak cameras were employed. The time interval between the primary anjegecondary reaction has been preliminarilymeasur- he camera schedule, which relates — a to the accompanying figure s, is given in Table 15.2-1, The figures are contact prints of the records obtained and illustrate many interesting details of the luminous phenomena associated with the detonation, the usual gamma and neutron Teller flashes are seen as is the fireball growth in its earliest stages, TABLE 15,2-~1 - CAMFRA SCHEDULE Fig. No. Writing Speed Telescope Focal Length 1 10.2 mys 2 15.1 * 240 3 10.4 " 4 10.5 5 5.4 6 7 COPIED/DOE LANL RC Slit Width Inches Time sh 2025 3.6 * 2025 2.4 60 * 0025 3.6 # * 240 4A 050 72 " CO 40 * 2025 7.2 n 5.4 240 * -050 W.4 ® 60 * 025 3.6 10.3 =" 60 inches Field of View . oo. ig « | . Slit vertical, device near lower end. Slit horiz., aimed above device . Slit vertical device near - lower end, Ro ne 5 a 2 oo ; n o a