HANDS-ON SCIENCE.(how to make a periscope)(Brief Article)

From: Science World | Date: March 20, 2000 | Copyright information

Scope it Out

YOU NEED:

2 empty paper-towel tubes

* masking tape * 2 old CDs

* ruler * scissors

TO DO:

1. Lines up the two paper-towel tubes end to end. Tape together where they meet.

2. Find the lines where strips of cardboard meet.

3. Measure a spot 8 cm (3 in.) from the end of the tube. Find the closest slanted line.

4. Cut a slit 5 cm (2 in.) long along the line.

5....

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