6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics and 6V-powered ignition light staging

and 6V-powered ignition light staging each step

5 inch dimensions in brass

Plastic-bodied wave apparatus with eccentric discs that drive metal rods up and down as the handle turns

exposing the full urinary tract for combined anatomy and physiology teaching at 15 by 9 inches

this motor-generator pairs a split-ring commutator against slip rings with bulb indicators

6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics and 6V-powered ignition light stagingSix piece 3 inch optical lens set combining three double convex and three double concave glass lenses at 200mm, 300mm, and 500mm focal lengths for comparative refraction experiments.