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photochronograph photochronograph (ˌfəʊtəʊˈkrɒnəˌɡrɑːf; -ˌɡræf) n (General Physics) physics an instrument for measuring very small time intervals by the trace made by a beam of light on a moving photographic film photochronography npho•to•chron•o•graph (ˌfoʊ təˈkrɒn əˌgræf, -ˌgrɑf)
n. 1. a device formerly used for taking a series of instantaneous photographs of a rapidly moving object. 2. a picture taken by such a device. [1885–90] pho•to•chro•nog•ra•phy (ˌfoʊ toʊ krəˈnɒg rə fi) n. photochronograph1. a camera for recording motion by a series of photographs taken at brief intervals.
2. the photograph so produced.
3. a camera that records the exact time of the event it is photographing by exposing a moving sensitized plate to the tracing of a thin beam of light synchronized with the event.See also: Photography, Time
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