m is that the bottom one goes in the opposite direction to the top, as there’s only one pivot.
You can rearrange the same number of articulation points to give an output in the same direction as the input, or by using a bell crank instead of a straight link in any arbitrary direction between the two
You can rearrange the same number of articulation points to give an output in the same direction as the input, or by using a bell crank instead of a straight link in any arbitrary direction between the two