Perpendicular Straight Line Bar 1

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Perpendicular Straight Line Bar 1
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, really old, but still interesting and useful.
In this mechanism, one bar (blue) describes a straight line movement, perpendicular to a reference (black). The bars remain parallel all the time.
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What are the distances of all of the colors?

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