Easy-to-follow text. Helpful photographs.The trick was being quick enough to get through before the mechanism started to grind unstoppably into action. ... Okay, so all the strings and pulleys do most cleverly move into action when the lever is pulled down, and the boot does kickanbsp;...
|Title||:||Making Marble-action Games, Gadgets, Mazes, and Contraptions|
|Author||:||Alan Bridgewater, Gill Bridgewater|
|Publisher||:||Stackpole Books - 1999|