"PARKWAY PLASTICS, INC."

Buff, coarse, crystalline “Austin Marble” with shell casts and molds.

Pyroxene group; dark green, pure cleaved fragments.

Feldspar group; white to gray, sodium plagioclase cleavages; some faces may show twinning.

Grayish black trap rock.

Gray with line crinoid columnal fragments.

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

Dark brown to black; polycrystalline zinc ore.

Bigger design for easy connections.

This set is economical, durable, and versatile.

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.

Everything need for starting a dissection.

The Centripetal Force Kit is inexpensive and effective.

Reliable kit in a quality carrying case!

Vividly demonstrate the power of magnetic attraction.