Pete Swanstrom commented: > I understand in lime silos, where they convey the lime into the silo by >blowing it through a metal pipe to the top of the silo, that the 90 degree >elbows in the pipe would rapidly erode and fail. Then someone discovered >that if they intentionally built a small pocket into the outer bend inside >of the elbow, the void would create a vortex that would help divert the >abrasive lime grit around inside the elbow without errosion. > > I wonder if the inscription within your stone has a similar effect, >diverting blowing sand away to outside of the lettering.
As part of my original query I raised: >>...is it at all likely that turbulence caused by the deeply-incised lettering >>would somehow cushion the lettering and its immediately surrounding areas >>and protect them from wind-borne sand etc. while flat areas took it full >>in the face? Is the 'Coanda effect' lurking somewhere in the background >>perhaps? And if flow in pipes is affected in this way maybe Henri C. might indeed be involved in some way. Thanks for this useful sidelight Pete. Tony Moss. -
