Vacuum Pump Plate on Aluminum Base with Rubber Seal, 10" Diameter Entomology & Zoology_Zoology Models and 50mm wheel diameters in

and 50mm wheel diameters in open-sided frames

sized for short-time-constant RC charging investigations and demonstrations of energy stored as half-CV-squared

this microphone amplifier connects a microphone input to both an integrated speaker and an oscilloscope-driving amplified signal for waveform study

One-thousand-ohm 0

suited to fieldwork in geography units and orientation activities outside the classroom

Vacuum Pump Plate on Aluminum Base with Rubber Seal, 10" Diameter Entomology & Zoology_Zoology Models and 50mm wheel diameters in10 inch vacuum pump plate on an aluminum base with a stopcock and rubber seal, sized to accept a bell jar for atmospheric pressure and vacuum demonstrations.