Lockyer gives little information, especially how and where his results were obtained. He says he sent Captain Henderson here in 1905, in the wind and rain. There is no evidence that he ever visited Trethevy, and indeed elsewhere he apologises for leaving surveying work to others. The alignment he mentions seems to mean the way the quoit is 'pointing', that is towards the SW, but there is little symmetry in this structure and he is vague as to method. We suspect Zennor Quoit may have had a similar solar usage for it bears a strong resemblance to Trethevy, but we have not surveyed it. A keen student is going there with bicycle, camera etc. in June to start elementary fieldwork preparatory to a general study. Lockyer's papers are in the care of Exeter University.
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