Boundary Disk Turbine and Pump" Swithenbank, Alan, "The Tesla Boundary Layer Turbine" Peterson, Gary, Nikola Tesla's Disk Turbine Tomorrow's Gas Engine. Feed Line No. 7 Boundary Layer Effect [https://www.pbs.org/tesla/ll/pv_gen_pop.html "Tesla turbine" from PBS Inventions by Nikola Tesla Turbines Boundary layers Mechanical devices using viscosity