Witness account · 3 min read · Set in Gannet Point ·
The Beam That Spelled Itself
A rotating lighthouse beam prints one letter of a sentence on its own wall per turn, and has read the sentence again every fog since.
- reliability: corroborated
- witness: "Harold Penhale, principal lighthouse keeper"
I keep the light at Gannet Point, nineteen winters this season, and I am stating the matter plainly because there is no other way to state it. On the night of the 14th of March, in fog, the rotating beam spelled a sentence across the inside of the watch room wall, one letter to each turn of the optic, and it has printed the same sentence again every fog since.
The optic turns once in twelve seconds. In fog the beam strikes the inner wall at every pass and lays a slow band of light round the plaster, even and wordless, the way it has done since the light was converted from oil. At three in the morning of that March night I was wiping condensation off the seaward panes when the returning beam stopped low on the wall and held there, which it does not do. On the next pass there was a second mark beside the first. I sat down on the chart stool and watched. By the fourth pass I had a letter, and I wrote it in the log as it came.
The beam printed for thirty-two turns, a little over six minutes. The letters read: YOUR LOG DIFFERS FROM OURS BY ONE ENTRY. They sat at knee height, hand-high, pale on the harbour-grey, the strokes of them even as stencil. When the last letter cooled the reading began again at the first, same turns, same order, and went on that way for as long as the fog held. The letters fade when the fog thins. There has never been a second sentence, and the fog signal, which sounds through every reading, has never once fallen out of step with the turns.
In daylight I went over every pane with a rag and a torch, hunting film or slip or drag, and the glass was clean. A glazier from the harbour works came at my request and measured the panes against the letters: a word of our length cannot be carried round on glass of our spacing, so the letters could not ride in on the optic that way. He signed his measure and left the sheet without a theory in it. In April the District sent a fitter. He stripped the panel frames and the lens beds and found nothing out of true; his sheet ends cause not established, wall repainted. The repainting held until the next fog.
So the rule stands as I first set it down, and the fogs since I can date off the log by their turns. The reading comes at the Thin Hour, never earlier, never later. My log for those nights is copied fair at the District, and the fair copies agree with mine line for line, which is the difficulty: whichever entry differs lives in a file I am never shown. For eleven years before March I logged the light before I logged the weather, every entry, every night. On sentence nights I catch myself writing the weather first. I cannot find that reversal anywhere else in nineteen winters of books.
On the fog of the 2nd of November my relief keeper, Douglas Renn, stood the full six minutes at the wall with me and read it out to the last letter, and signed the log: read and agreed, D. Renn. He put in for a daylight station the following week and was moved without a word passing between us on the reason. He is the only other person who has read the wall, so the account stands corroborated, by one signature, which is more than most of what I sign for gets. And signatures are the whole of what this service ever trades in.
What I cannot close, and leave standing: if the beam prints that sentence on the plaster only while I am in the room counting the turns, what is it printing, those same fogs and the same six minutes, on the water?