The term 'Device for Hurling Stones' can be summarized by two crossword solutions: 'SLING' (5 letters) and 'CATAPULT' (8 letters). A SLING is a device used to hurl stones, consisting of a Y-shaped frame with a pouch in the middle. It has been used since ancient times as a weapon and hunting tool. A CATAPULT is a device used to launch a projectile a great distance, usually by means of a lever and a counterweight. It was used in warfare during the Middle Ages and is still used today in some forms.