United Scientific Supplies

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US$24.43
This is for determining the electrical equivalent of heat. The cover contains a mounted heating coil of about 1.5 ohms resistance with standard binding posts for electrical connections. When connected to a 6-volt battery, this coil will cause a temperature rise of about 5 degrees centigrade in 10 minutes.
Delivery within 1-2 weeks
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US$26.01

This is a pre-assembled DC Motor designed for students to learn about electromagnetic forces. The open structure resembles the diagram found in many textbooks. The polarity of the magnets can be reversed to change the direction of the rotation. The motor can also be used with a rheostat to observe the change of speed with the change of current.

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US$31.96
Set includes two helical springs and a length of cotton string. The long narrow spring measures 3/4" x 72" and can be extended to 5 meters. The larger spring measures 3" x 4" and can be extended many times its length without distortion. Includes an actvity guide.
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US$36.88
Students can build a bar-shaped and a U-shaped electromagnet which they power with a 6V battery (not included) or DC power supply (not included), to determine the magnitude and polarity of electromagnetic forces.
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US$2.73
The Magnet Stirrup provides support for bar magnets or friction rods. Allows magnets or friction rods to hang freely and turn in a horizontal plane. Hooks are 89mm apart. Dimensions 3 1/2 x 2 x 1.
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US$9.46

This Floating Magnet Set contains 6 brightly colored magnetic rings, and the plastic stand, in a cardboard storage box. We have designed a special stand to replace the pencil, for hands-free demonstration. Magnets are in plastic cases, to reduce breakage.

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US$14.70
This consists of red and blue Plastic Covered Magnets. These magnets are attractive as well as an easy way to teach magnetic attraction and repulsion. Each magnet's dimensions are 80 x 22 x 10mm.
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US$48.13
An exceptional value! Comes in a reusable storage box. Contents:1 Steel horseshoe magnet, 2 Ceramic bar magnets,3 Ceramic donut magnets, 4 Metal squares (iron, copper, aluminum and zinc), 1 Iron filings pack, 1 Lodestone, 2 Magnetic compasses, 1 Activity Guide containing 17 experiments.
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US$15.46

These Alnico U Shaped Magnets are painted red and supplied with a keeper.

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US$4.23
These strong steel horseshoe magnets are marked with North and south poles and supplied with keeper.
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US$5.96
This is a set of six colorful Ceramic Disc Magnets in six primary colors. Each magnet is 25mm in diameter.
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US$46.54
Provides a quick and clean way to visualize magnetic fields. The demonstrator is a transparent acrylic case that holds iron filings suspended in a fluid of appropriate viscosity. When it is placed over a magnet, the field pattern can be viewed directly, or it can be placed on an overhead projector for classroom demonstration.
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US$6.55
The lodestone is a natural rock that contains traces of iron ore with natural magnetic properties. This magnetic lodestone was made into a magnet by the earth's magnetic field. 
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US$36.05
This Eddy Current Demonstrator consists of a 12" long copper tube and two apparently identical metal slugs with rubber end caps. One slug is plain steel and falls through the copper tube quickly. The other slug is a strong neodymium magnet that falls very slowly through the tube due to the breaking effect of eddy currents.
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US$32.82
This Hooke's Law Apparatus quantitatively shows the principles related to Hooke's Law. Includes a 14 metal rod that mounts on a 4-1/2 diameter base. Scale in centimeters and inches can be easily adjusted along the rod. The plated steel weight holder and spring are attached to an adjustable collar with crossbar.
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US$11.65
Set includes 1 each of 1, 5, 10, 50, 100, and 500 mg weights, and 2 each of 2, 20, and 200 mg weights. Also includes rectangular plastic box with rider and forceps.
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