Replacement Pith Balls for Electroscope, 10-Pack Subcategory_Pressure and Gas Laws and aluminum at a shared

and aluminum at a shared 0

and 4-pole armature configurations on the same motor frame by swapping interchangeable enameled-copper armatures past a permanent bar magnet on a disc commutator

and a 1-degree protractor

and single-celled organism structure for protist biology teaching

this Van de Graaff generator delivers spark-producing high-voltage demonstrations in the physics classroom

Replacement Pith Balls for Electroscope, 10-Pack Subcategory_Pressure and Gas Laws and aluminum at a sharedSpare pack of ten low mass pith balls sized for the standard pith ball electroscope, supplying replacements when the originals lose loft or split during repeated charging cycles.