Spherical Conductor, 8cm Diameter Subcategory_Sound and Resonance supporting variable audio modulation 1Hz-1kHz

supporting variable audio modulation 1Hz-1kHz plus a 250kHz square wave for speed-of-light measurement work

this large-capacity polypropylene measuring jug carries raised graduations and tolerates autoclave

showing how current through an iron core builds magnetic flux in student investigations

Rectangular casted metal case and polythene insulated lid with finger flap to facilitate removal & front glass window

set in motion by ion wind from corona discharge whenever the apparatus is connected to a high-voltage source

Spherical Conductor, 8cm Diameter Subcategory_Sound and Resonance supporting variable audio modulation 1Hz-1kHzPolished 8cm brass sphere on an ebonite insulated metal base, sized to retain induced charge through demonstrations of Coulomb's law and surface charge distribution.