Title:  The Crossbow: Medieval and Modern Military and Sporting.

Date:  1840-1845.

Source:  Costumes of Mediaeval Christendom.

Information:  The kneeling and seated figures in this diagram illustrate how a crossbow is first drawn and then loaded. This is contrasted by the standing figure, who shows how much more rapidly a conventional bow can be fired.

Source: 
uh.edu