Decade Capacitance Box, Model F Graduations_Ungraduated providing dense uniform spheres for

providing dense uniform spheres for ramp-and-collision experiments where a heavier projectile is needed than the plastic marbles can provide

Compass mounted parallel to a current-carrying coil deflects against Earth's horizontal field

supplying replacement bulbs for four-cell battery packs and the standard 6V ray-box and panel-lamp apparatus

supplied in a storage case for student precision work

Decade Capacitance Box, Model F Graduations_Ungraduated providing dense uniform spheres forUsed to substitute calibrated capacitance into AC circuits without rewiring, this decade box selects cascaded values for RC time constant, resonance, and frequency response student work.