February 2009
Intermediate to advanced
192 pages
8h 28m
English
Before Chester Carlson invented photocopying, inventors engineered various mechanical devices to replicate images. With a few everyday items found in the home, you can make a pantograph, an image duplicator that allows you to use one pencil to trace an image while another pencil follows its path in parallel to produce a near-identical copy.
1. Cut out and position cardboard strips.
You’ll need 4 cardboard strips. Cut 2 strips measuring 2"×4" and another pair 2"×8", as shown in Figure 1. Place the 2 pairs of strips at right angles to each other, with the smaller pair lying on top of the larger pair.
2. Link cardboard strips with paper clips.
Cut 4 holes in the strips and slip 3 paper clips into them, ...