What was the classical experiment conducted by William Harvey to demonstrate movement of blood in veins ?

Explanation

1) In early 17th century William Harvey conducted an experiment to demonstrate the movement of blood in veins.
2) Tie a tornquit just above the elbow of a person, whose blood vessels are prominent in the hand.

3) Ask that person to hold the fist with a piece of cloth rolled in the hand. Now the blood vessels can be seen more prominently.
4) Fine undivided blood vessel, where we have to work for the next few minutes.
5) At the end of the vessel farthest from the elbow apply steady pressure, so as to close its cavity.
6) Now apply pressure from elbow towards the palm slowly and observe the changes in the blood vessels.