Whether playing at defending their own castle or simply chucking pumpkins over a fence, wannabe marauders and tinkerers will become fast acquainted with ancient artillery devices known commonly as catapults. Re-creating these simple yet sophisticated machines introduces fundamentals of math and physics using levers, force, torsion, tension, and traction. Instructions and diagrams illustrate how to build seven working model catapults. Additional projects include learning how to lash and make rope and how to construct and use a hand sling and a staff sling.
|
ISBN UPC: |
9781556525261 |
|
Format: |
Book |
|
Cover: |
Softcover |
|
Author: |
Williams Gurstelle |
|
Copyright: |
2004 |
|
Length: |
160 pages |