Thanks Cassini for this piece on Knock. I do find it interesting that the Apparition of Knock was "silent," and of course we who attend the Latin Low Mass can relate to its silent nature. Contrast this with the Novus Ordo Mass which is all about noise. The whole nature of New Mass is that if the priest faces the people and makes some noise, then the people will be better able to relate to the divine.
In 1879 the world was still silent (the steam engine being the one exception), but all that would change with the radio, the television, and cellphones.