Polarizing Filter Pair, 50 x 50mm Pack Size_2 the half-size circulatory model traces

the half-size circulatory model traces arterial and venous pathways from heart to peripheral capillaries

75 inches wide for torsion-balance and electrostatic-induction setups

At a full-inch diameter

and hinge-distance scales adjustable from 0 to 45 degrees

this 6-inch Alnico bar pair extends field lines visibly along the magnet body for full-class iron-filing demonstrations

Polarizing Filter Pair, 50 x 50mm Pack Size_2 the half-size circulatory model tracesPolaroid film 45 x 23mm sits in 50 x 50mm plastic frames as a matched pair, transmitting maximum light when their axes align and nearly extinguishing it when crossed at 90 degrees.