Page 15 - Demo

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WATER & THE EARTH’S SURFACE, continued
Density Box—Demonstration Kit
Students watch with amazement as warm water rises and cold water sinks in this clever demonstration of density. Hot, red water
is placed on one side of the clear acrylic chamber and cold, blue water on the other. The center dividing wall is then carefully removed, allowing the two solutions to mix. A great demonstration when discussing convection currents, air turbulence and water turnover in lakes and ponds.
AP4784 I $39.10
Student Compasses
Looking for low-cost, student-size compasses? These small compasses are ideally suited for student labs and for tracing the magnetic fields of bar magnets. Plastic encasement. 20 mm diameter. A package of 30 compasses is also available.
AP5285 I Each I $1.05 AP6387 I Package of 30 I $28.15
Binoculars, Full-Size, 8 x 42
High quality and durability at an extremely affordable price. The 10 x 25 compact binoculars contain state-of-the-art prisms for clear crisp images. Non-slip rubber armor provides a firm grip and is shock-resistant
if dropped. The 8 x 42 full-size binoculars feature a wide-angle prism design with one-touch Insta-focus for fast and easy focus on moving targets. Bright clear images
are always guaranteed. Each binocular is complete with neck strap and durable carrying case.
Stereoscope Glasses
Create that third dimension with these economical yet durable desktop stereo- scope viewers! Just open the sturdy metal legs, set the glasses over a stereogram or pair of stereo pictures, peer through the lenses, and get pulled into the three-dimen- sional view. It’s amazing how real the images appear! Acrylic lenses and frame are easy
to clean. 2.2X magnification and adjustable interpupillary distance. Folds to a flat, easy- to-store size of 51⁄2" x 21⁄2".
AP5264 I $9.85
AP6508 I $120.00
Hands-on science made easier!
How to Make Your Own Compass
Materials:
Cork (or other small floating material, such as a milk jug cap or the bottom of a Styrofoam® cup)
Dish, 9–12" in diameter, filled with 1" of water
Magnet
Needle (or a straightened paper clip)
Procedure:
1. Turn the needle into a magnet by stroking it in one direction along the needle 10–20 times.
2. Place the cork or other floating device in the center of the dish of water. This “float on water” technique creates a nearly frictionless bearing.
3. Center the “magnetic” needle on the float. It very slowly will point north. You have created a compass!
More options at flinnsci.com
WATER & THE EARTH’S SURFACE I FLINN SCIENTIFIC 13