Parallel and Series Circuit Demonstrator Pack Size_5 Six-lens optics set of three

Six-lens optics set of three double-convex and three double-concave glass lenses with ground beveled edges

Semi-stiff nylon bristle brush on a twisted stainless steel wire handle

supplying replacements when the originals lose loft or split during repeated charging cycles

Giant Newton's cradle at 12

Spare pack of ten low-mass pith balls sized for the standard pith-ball electroscope

Parallel and Series Circuit Demonstrator Pack Size_5 Six-lens optics set of threeFive bulb circuit demonstrator with 8 removable metal bars on a heavy base, letting students rearrange bars to convert between series and parallel topologies on the same set of lamps.