Catapults are ancient weapons that are still quite capable of inflicting a tremendous amount of damage, but you can actually have a lot of fun with them and even put them to practical use. Got a field of rocks you want moved? Author Bill Wilson puts his interest in catapults to work and the result is this handy how-to. Once you have followed the instructions in his book and built your own catapult, you'll wonder how you managed to get along without one. Contents Include: History and Introduction - Build a Catapult - Build a Ballista - Ammunition and Other Ideas and Resources. 5 x 8, 85 pages, illus., photographs, soft cover.