6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics Plastic-bodied wave apparatus with eccentric

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

this cast double burette clamp secures two burettes side by side for back-titration and comparative analytical procedures

5 inch dimensions in brass

and bladder in anatomical position

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

6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics Plastic-bodied wave apparatus with eccentricSix 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.