Wankel Rotary Engine Model StockedLY9121 Six-lens optics set of three

Six-lens optics set of three double-convex and three double-concave glass lenses with ground beveled edges

anchoring retort stands and apparatus to the edge of a classroom workbench

Hand-painted 4-part human brain model separates into cortical hemispheres and brain-stem regions for lobed-anatomy teaching at introductory biology levels

this 2-pack of 20oz Griffin-shape borosilicate beakers adds a pouring spout for everyday home use

Wankel Rotary Engine Model StockedLY9121 Six-lens optics set of threeCutaway hand powered Wankel rotary model at 8 by 7 by 3. 5 inches on an 8 by 8 by 2. 5 inch base, exposing the triangular rotor's epitrochoidal motion with a lamp lit ignition point.