6-Piece Optical Lens Set, 3", Double Convex and Double Concave Base_Octagonal supporting three-rope compound arrangements for

supporting three-rope compound arrangements for advanced mechanical-advantage investigations

exposing the triangular rotor's epitrochoidal motion with a lamp-lit ignition point

telophase — progress across this plant mitosis model for cell division teaching in biology courses

Needle valve and flame stabilizer deliver fine flame control on this liquid propane Bunsen burner for precision chemistry and biology heating work

6-Piece Optical Lens Set, 3", Double Convex and Double Concave Base_Octagonal supporting three-rope compound arrangements forSix 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.