Frictionless coatings that never wear out in machines that last for centuries.
Furthermore, because most lingerie fabrics are rather frictionless, they will slide around in too large a box unless they are adequately secured with pins (choose slender pins that will not damage the fabric).
In Thomas Walker's harpoon or frictionless log, introduced in 1861, the wheelwork was enclosed in a cylindrical case of the same diameter as the body of the rotator or fan, and the latter was brought close up to the register, forming a compact machine and avoiding the use of the 6-ft.
Thomson (Lord Kelvin) to form a theory of vortex atoms in a homogeneous, incompressible and frictionless liquid."
If this relation is true along all paths, the velocity of the aether must be of irrotational type, like that of frictionless fluid.