Input: blue shaft of two 90 deg. runways.
Output: pink slider linearly reciprocating. Its stroke length: AB
It moves as if it belongs to a slider-crank mechanism of crank OR (RA = RB) and conrod RC.
Orange ellipse, green circle and violet ellipse are loci of points A, R and B respectively.
The loci are drawn 2 times in one revolution of the input.
One revolution of the input corresponds with two strokes of the pink slider.
This mechanism is numbered as 348 in the book “507 mechanical movements”, 1868.