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From the book "How to Draw a Straight Line; A Lecture on Linkages", by A.B. Kempe, London, 1877.
This is a series of linkage mechanisms, very old, but still interesting and useful.
In this mechanism, one point (blue) describes a straight line movement, perpendicular to a reference (red). Scheme at https://br.pinterest.com/pin/479070479118547611.