6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics this cast double burette clamp

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

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

Four-metal 32mm density cube set with hooks in brass

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

Used to crank a row of 16 cam-driven rods through a moving sine wave

6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics this cast double burette clampSix 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.