In 1872 they found an ogham-inscribed Celtic cross at the Broch of Burrian on North Ronaldsay in Orkney. Still undeciphered AFAIK. In summer 1883 a horizontal line was found in Hoy churchyard with markings on both sides. Next year, a rubbing having been taken, various translations were attempted of the ogham and the 'winner' showed it as representing a few lines taken from the text of a specific old Irish tale. And then someone mentioned that the grasscutter cleaned his scythe on gravestones and it all faded into mist.