EARLY in the month of July 1861 I was enabled, by the kind permission of my friend David Balfour, Esq. of Balfour and Trenaby, to put in execution a scheme long contemplated, but from various circumstances unavoidably delayed, the excavation of some of the great tumuli in the neighbourhood of the Stones of Stennes, or Ring of Brogar.
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I had in the year 1854 partially explored one of considerable size on the east side of the great circle of stones, which stands on the west shore of the Loch of Harray. No discovery, however, of any importance was then made.
Some days were devoted to excavations close to Stennes, to which allusion will afterwards be made, but as several gentlemen of well-known antiquarian reputation from Edinburgh and Aberdeen were expected, and as I was desirous of having the benefit of their experience and advice, I determined at once to commence operations on the great tumulus of Maes-howe, the subject of this notice. My attention had been particularly called to this tumulus by Mr. Balfour, whose decided opinion that a careful examination might result in some important discovery, afforded me great encouragement, as I well knew that he had for many years taken considerable interest in Orkney antiquities, and his opinion that Maes-howe was a sepulchral chamber, appeared to be confirmed by local traditions.
On the afternoon of Saturday the 6th of July, therefore, guided by the experience of Mr. George Petrie, and assisted by the professional knowledge of Mr. Wilson, road contractor, ground was broken on the west side of Maes-howe, and on the same evening, Mr. John Stuart and Mr. Joseph Robertson of Edinburgh, with Colonel Forbes Leslie of Rothie, and Mr. James Hay Chalmers of Aberdeen, arrived by the Prince Consort steamship. As it was anticipated that a couple of days would suffice to make a large opening in the tumulus, arrangements were made for meeting there on the 10th of July. Before proceeding with the description of what followed, it may not be out of place to give a short account of the Stones of Stennes, as described by Lieutenant Thomas in a work published by him in 1851:-
"The Great Circle of Stennes, or Ring of Brogar, is a deeply entrenched circular space containing almost two acres and a half of superficies, of which the diameter is 366 feet. Around the circumference of the area, but about thirteen feet within the trench, are the erect stones, standing at an average distance of eighteen feet apart. They are totally unhewn, and vary considerably in form and size. The highest stone was found to be 13-9 feet above the surface, and judging from some others which have fallen, it is sunk about eighteen inches in the ground. The smallest stone is less than six feet, but the average height is from eight to ten. The breadth varies from 2-6 to 7-9 feet, but the average may be stated at about 5 feet, and the thickness about 1 foot-all of the old red sandstone formation.
The trench round the area is in good preservation. The edge of the bank is still sharply defined, as well as the two foot-banks or entrances, which are placed exactly opposite to each other. They have no relation to the true or magnetic meridian, but are parallel to the general direction of the neck of land on which the circle is placed. The trench is 29 feet in breadth, and about 6 in depth, and the entrances are formed by narrow earth-banks across the fosse. The surface of the enclosed area has an average inclination to the eastward. It is highest on the north-west quarter, and the extreme difference of level is estimated to be from 6 to 7 feet. The trench has the same inclination, and therefore could never be designed to hold water."