Brass Tube Resonance Apparatus Subcategory_Botany Models deflecting a pivoting cobalt-steel compass

deflecting a pivoting cobalt-steel compass needle inside a rectangular conductor frame to show that current generates a magnetic field

Battery-powered iron-clad electromagnet that lifts up to 100 pounds from its end hooks on four C cells

Manually-operated seismograph model that traces shock waves onto a pulled paper strip

and hinge-distance scales

Brass Tube Resonance Apparatus Subcategory_Botany Models deflecting a pivoting cobalt-steel compassBrass tube resonance apparatus designed to amplify a struck tuning fork at specific air column lengths, letting students plot resonance against length and back calculate the speed of sound.