Photochronograph
[foh-tuh-kron-uh-graf, -grahf] /ˌfoʊ təˈkrɒn əˌgræf, -ˌgrɑf/
noun
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.
3.
a in which the tracing or record is made by a pencil of light on a sensitized surface.
4.
an instrument for measuring small intervals of time by the photographic trace of a pencil of light.
/ˌfəʊtəʊˈkrɒnəˌɡrɑːf; -ˌɡræf/
noun
1.
(physics) an instrument for measuring very small time intervals by the trace made by a beam of light on a moving photographic film
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