7-Piece Cross-Sectional Earth Globe Model Chemistry_Chemistry Charts & Molecular Models Two pith balls suspended on

Two pith balls suspended on unspun silk from a brass pillar

Tandem double plastic pulley pairing 38mm and 50mm low-friction wheels on an open-sided steel frame

Life-size right lung separates into two parts exposing bronchial tree and alveolar structure

and resonance through a 6V motor driving cams and spring actuators across four springs and two hanging masses on a 19-inch frame

Twelve-slot natural wood buret rack organizes vertical buret storage and simultaneous titration setup in chemistry and analytical laboratory classrooms

7-Piece Cross-Sectional Earth Globe Model Chemistry_Chemistry Charts & Molecular Models Two pith balls suspended onReveals Earth's internal structure through a seven piece cross sectional globe whose crust, mantle, and core layers detach one by one for geology instruction.