12" Connecting Lead with Alligator Clip and 4mm Plug, Black Science at Home_Chemical Science Tandem double plastic pulley pairing

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

Square-topped wooden screw simple-machine model with a leverage block

and magnetic strength relationships

this bottle of coarse 20-mesh iron filings is a staple for classroom magnetism and field-pattern demonstrations

Designed to recharge the cells used in laboratory apparatus

12" Connecting Lead with Alligator Clip and 4mm Plug, Black Science at Home_Chemical Science Tandem double plastic pulley pairingPlug to clip 12 inch black lead combining a 4mm banana plug at one end with an alligator clip at the other, bridging instrument panels to bare wire components without rewiring.