Section liner drawing instrument - GIF

A section liner is a drawing instrument used for drawing parallel lines.

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Previously:

https://www.homemadetools.net/forum/...805#post156136
https://www.homemadetools.net/forum/...651#post155592
https://www.homemadetools.net/forum/...112#post125899
https://www.homemadetools.net/forum/...422#post127363

Rolling rulers are still sold...

https://www.amazon.com/MyLifeUNIT-Mu...s%2C207&sr=8-3

and, IMO, are easier to use and require less work space than conventional parallel rulers...

https://www.amazon.com/Alvin-A1500-1...s%2C207&sr=8-1

Still using both rolling and walking parallels, a lot to enjoy about mechanical drawing.
This rack and pinion thing is new to me, and maybe as old, but that HB lead makes worst section lines ever!