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electro-chronograph
electro-chronograph n. 
/ᵻˌlɛktrəʊˈkrɒnəɡraf/, /iˌlɛktroʊˈkrɑnəˌɡræf/ now historical an instrument for recording the exact time of (usually astronomical) events by means of interruption of an electrical circuit.
Brit. /ᵻˌlɛktrəʊˈkrɒnəɡrɑːf/
, /ᵻˌlɛktrəʊˈkrɒnəɡrɑːf//ᵻˌlɛktrəʊˈkrɒnəɡraf/U.S. /əˌlɛktroʊˈkrɑnəˌɡræf/
, /əˌlɛktroʊˈkrɑnəˌɡræf//iˌlɛktroʊˈkrɑnəˌɡræf/ΚΠ
1849 J. Locke in Amer. Jrnl. Sci. 8 231 I propose first to give some brief definitions of the Electro-chronograph.
1878 S. Newcomb Pop. Astron. ii. ii. 157 When the observer makes a telegraph record of the moment of transit of a star by striking a key..it is evident that the electro-chronograph on which his taps are recorded may be at any distance to which the electric current can carry his signal.
2001 Brit. Jrnl. Hist. Sci. 34 176 The new electro-chronograph (also known as the American method) was slowly replacing the old eye-and-ear method for measuring stellar transits involved in longitude and time determinations.
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