Linear Expansion Apparatus with Aluminum, Brass, and Iron Rods, 18cm Electricity & Magnetism_Magnetism each topped with a small

each topped with a small handling knob and stored in a hardwood block for classroom balance coursework

each foam-protected in a wooden case with frequencies labeled

Three-part medical-quality human skull model with a removable calvarium and articulated mandible

Fourteen-specimen solid materials kit in assorted shapes across brass

Two independent output channels on this compact AC/DC power supply deliver six selectable voltages up to 12V at 500 mA each

Linear Expansion Apparatus with Aluminum, Brass, and Iron Rods, 18cm Electricity & Magnetism_Magnetism each topped with a smallCast iron uprights support a 38cm expansion bar against a friction pointer dial reading 0 to 90 degrees, supplied with aluminum, brass, and iron rods for linear expansion comparison.