Input: green crank.
Output: yellow square, velocity of which is double of the input one.
The video shows that 90 deg. input oscillation gives 180 deg. output oscillation.
The wheels have Archimedean grooves of the same radial. distance between successive turnings and of opposite spiral directions.
Distance between two red pins of blue slider is equal to the one between two revolution joints of the green crank.
The square is fixed to the yellow wheel.