Rolling Friction Hall's Carriages with 4 Wheel Types Item Type_Spoon Five-ohm reference coil non-inductively wound

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

Built to soften stoppers before boring

Nineteen hardwood three-dimensional geometric shapes in a dovetailed sliding-top case

featuring fine-mesh muslin netting

75 inches of usable track gives upper-division optics setups the rigidity needed for lens

Rolling Friction Hall's Carriages with 4 Wheel Types Item Type_Spoon Five-ohm reference coil non-inductively woundHall's pattern carriage set of four ABS cars with different wheel types, sized to compare rolling friction coefficients across surfaces and demonstrate how wheel design affects energy loss.