"PARKWAY PLASTICS, INC."

Gray with line crinoid columnal fragments.

Pure, large, transparent-to-translucent cleavages, Mohs’ hardness of 4.

Bigger design for easy connections.

This set is economical, durable, and versatile.

Lens holder for 50 mm lenses or mirrors for use with Eisco Optical Bench.

The durable Wilmshurst Machine is made for years of use.

Students actively model the concept of half-life and radioactive decay.

Economy Color-Coded Spring Scales

These pocket magnifiers are economical enough to outfit an entire class.

Tandem pulleys give students a clear picture of mechanical advantage and velocity ratio in a pulley system.

Hands-On Manipulation with Colorful Models.

Reliable kit in a quality carrying case!

Introduce coding and programming in a fun an easy way.

Red, earthy, in natural chunk form; common pigment ore.

Feldspar group; good cleavages of pure soda lime feldspar; most show twinning and labradorescence.

Amphibole group; dark greenish black cleavages, somewhat columnar.