"PARKWAY PLASTICS, INC."

A bare copper wire of the highest quality. Available in several standard AWG sizes.

A high quality enameled, copper magnet wire.

A good quality bare iron wire. AWG 20.

This package of plastic pulleys contains 25 each of 20, 30 and 40 mm diameter pulleys with 3.2 mm bores and one 10 mm pulley with a push fit to a 2 mm motor shaft.

Nine level conductivity meter shows the relative conductivity/resistance of liquids and solids. As the conductivity of the tested material increases, the number of glowing red LEDs will increase to a maximum of 8, which indicates a very good conductor. There will be zero glowing red LEDs if the material has a very low electrical conductivity (is a good insulator).

Ideal selection for use with a ray box.

Boomwackers are brighly colored plastic tubes tuned by length to musical notes.

High Quality and Economical

High quality density cubes for the classroom.

These glasses make the study of light and color fun and easy.

The durable Wilmshurst Machine is made for years of use.

An economical digital stroboscope.

Observe phase reversal at the fixed end of wave pulses with this spring used to test waves in fundamental and multiple vibrations.

With the Large Plastic Dynamics Cart, students can explore the changes in motion that occur in a dynamics cart when different amounts of net force are applied.

Reliable kit in a quality carrying case!

Hands on demomstration showing the power of a vacuum.