Double Concave Glass Lens, 50mm Diameter, 100mm Focal Length, 8mm Thick Lab Equipment and Supplies_Metal Labware Five-ohm reference coil non-inductively wound

Five-ohm reference coil non-inductively wound from double silk-covered constantan inside a transparent tube

supporting three-rope compound arrangements for advanced mechanical-advantage investigations

this density cube set — brass

sized for routing around components and through apparatus where solid-core wire would be too stiff to follow the bend

and symmetry

Double Concave Glass Lens, 50mm Diameter, 100mm Focal Length, 8mm Thick Lab Equipment and Supplies_Metal Labware Five-ohm reference coil non-inductively woundGlass double concave lens at 50mm diameter and 100mm focal length, an 8mm thick blank delivering the same diverging behavior at lower mass for ray box and small mount setups.