Large Brass Bucket and Cylinder, 6cm Capacity_600mL Tandem double plastic pulley pairing

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

and vascular cylinder for plant anatomy and absorption teaching

transparent walls revealing the valve-and-piston action of suction pumping

this wooden simple-machine model lets students measure input effort against output splitting force at different wedge angles

Pairs 50mm of aperture with a 200mm focal length on a convex glass surface

Large Brass Bucket and Cylinder, 6cm Capacity_600mL Tandem double plastic pulley pairingLarge format aluminum bucket and cylinder set for Archimedes principle demonstration, with a 6cm cylinder extending to 16cm overall for suspending submerged specimens in the bucket.