The use of automatic time-lapse camera systems, taking daily photographs at solar noon between 26 September 1977 and 3 May 1978, has made it possible to determine the time and rate of growth of frost blisters at Bear Rock near Fort Norman, N.W.T. The daily negatives have been printed and refilmed to produce a time-lapse motion picture covering the full 220 day observation period. The use of paired cameras allowed production and viewing of daily stereo pairs.

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