I was also thinking this might be about how one draws a straight line. If you found those links interesting, you might also enjoy How Round is Your Circle[0].
Fun fact, Bosch's Axial Glide miter saw uses a Sarrus linkage rather than slides to generate it's straight line motion. I thought it was kind of a neat application for the oldest straight line linkage, especially since it didn't get much traction when it was first invented. It turns out for most application, a planar linkage is preferable.
Fun fact, Bosch's Axial Glide miter saw uses a Sarrus linkage rather than slides to generate it's straight line motion. I thought it was kind of a neat application for the oldest straight line linkage, especially since it didn't get much traction when it was first invented. It turns out for most application, a planar linkage is preferable.
[0] https://www.amazon.com/How-Round-Your-Circle-Engineering/dp/...