profilograph

noun
pro·​fil·​ograph | \ prōˈfiləˌgraf, -fīl-, -rȧf\

Definition of profilograph 

1 : an instrument borne on wheels for recording automatically the profile of the land over which it travels
2 : an instrument for measuring smoothness of a surface (as of a metal casting) by amplification of the minute variations from the plane or arc of smoothness

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History and Etymology for profilograph

International Scientific Vocabulary profile entry 1 + -o- + -graph; originally formed as French profilographe

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