photochronograph

American  

[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 chronograph 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.

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photochronograph British  

/ -ˌɡræf, ˌfəʊtəʊˈkrɒnəˌɡrɑːf, ˌfəʊtəʊkrəˈnɒɡrəfɪ /

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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Other Word Forms

• photochronography noun

Etymology

Origin of photochronograph

First recorded in 1885–90; photo- + chronograph

Example Sentences

As a young artilleryman, he invented the polarizing photochronograph to measure the speed of a projectile.

From Time Magazine Archive