"PARKWAY PLASTICS, INC."

Comprehensive Basic Electricity Kit For Building and Studying Circuits.

Density Cubes, Set of 7 Metals with Hooks, (20 mm) sides.

Set of 12 Delrin cylindrical bars of different length but the same diameter.

A working gauge is mounted in a transparent case so the actual working parts are visible.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Economical pulley for simple machine experiments.

Pulley with metal clamp attached.

Plastic pulley with two- part aluminum frame.

Plastic pulley with metal clamp, includes knob for tightening.

Kit to demonstrate force experiments.