Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length Length_150mm Ninety-five-piece molecular model set with

Ninety-five-piece molecular model set with 53 atoms and 42 links spanning organic and inorganic chemistry

Electric art electrolysis kit creates patterns through electrochemical reactions for 5 demonstrations of redox principles and surface chemistry

5 to 11 inches through hand-crank control

4A single-phase rheostat with cover-protected constantan winding on a 200x56mm tube and 4mm safety socket terminals

iodine mordant

Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length Length_150mm Ninety-five-piece molecular model set withLong focal double convex glass lens at 75mm diameter and 300mm focal length, the f 4 geometry pushing focal point well downrange for projection style image formation demos.