from the GNU version of the Collaborative International Dictionary of English
- n. An instrument for obtaining an accurate record of the time at which any observed phenomenon occurs, or of its duration. It has an electro-magnetic register connected with a clock. See chronograph.
from The Century Dictionary and Cyclopedia
- n. A chronograph on which the record is made by electrical means: much used in astronomical observatories and in the laboratory for noting the precise instant or duration of transits and similar phenomena. See chronograph.
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