Silk Cloth Square for Static Demonstrations, 12 x 12" Material_Bristle and troubleshooting exercises

and troubleshooting exercises

Aluminum-cased 4-inch plotting compass with a glass face

sized for low-current circuit work below the 1A range where finer resolution matters more than full-scale capacity

and inner ear sections support detailed auditory anatomy teaching at 3x enlargement for classroom visibility

polished with ground edges for image-formation experiments in introductory optics

Silk Cloth Square for Static Demonstrations, 12 x 12" Material_Bristle and troubleshooting exercisesUsed to draw electrons from glass and ebonite rods during rubbing, this silk square gives friction rods a strong positive charge for triboelectric and electrostatic demonstrations.