Mr. H. St. George Gray writes: “On Saturday morning, December 2, the southern of the two large stones at Beckhampton, in the parish of Avebury, North Wilts, fell without giving any warning. Had there been any indication of the likelihood of a fall, the owner of the arable field in which these large sarsens are situated (Mr. George Brown) would have had the stone propped. Within living memory it has always leaned to the south, whereas the stone standing some twenty-five paces to the north-east leans in a northerly direction. The fallen stone is rather the larger of the two. In its prostrate position it measures 18 feet 4 inches in length, its maximum width being nearly 16 feet; approximate thickness, 4 feet 7 inches. Its depth below the surface fo the field was found to be only 2 feet 6 inches; any sockethole there may be cut into the solid chalk must therefore be very shallow. Several small blocks of stones have been revealed by the fall of the monolith.
[...] On the Ordnance sheet the stones at Beckhampton are called ‘Long Stones.’ They are also known as the ‘Longstone Cove,’ and the’Devil’s Quoits.’ Aubrey spoke of three upright stones, but only two remained in Stukeley’s time. [...]”
In ‘Notes of the Month’ for January 1912, The Antiquary v48.