Rolling Friction Hall's Carriages with 4 Wheel Types Item Type_Spoon 75 inches of usable track

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

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

illustrating the high-ratio speed reduction and self-locking action of worm gearing

Feed indicator is in front and fed setting is at back of microtome which sets 1-50 micron

Built to soften stoppers before boring

Rolling Friction Hall's Carriages with 4 Wheel Types Item Type_Spoon 75 inches of usable trackHall'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.