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Transactions of the Symposium on Photo Interpretation

Fig. 4.
related but somewhat more elaborate type include two important varieties
(fig. 3). In one of these, the outer wall of the house consisted of small posts set
at intervals of one metre in a continuous trench, with interconnecting wattles
forming an effective screen. In the other, split timbers set contiguously had
been used for this purpose. In both these types, the houses measure char
acteristically 12 metres in diameter, and their plan includes a ring of up to
12 posts set on the circumference of a circle 8 metres in diameter concentric
with the outer wall, to carry the main supports of the roof.
Besides the ring-groove house, a second class of which many examples have
now been discovered on air-photographs is one in which a circular timber-framed
house stands entirely within a shallow but broad ditch which may be up to 2
metres wide (fig. 4). The ditch in such a house is not structural, but must have
served to drain the floor. This type of house is known as the ring-ditch house.
Since the initial discovery that such monuments could be detected on the
ground by the help of air-photographs, more than 50 individual monuments
and a great many more houses have been discovered by the same means. The
largest, for example, is a simple enclosure measuring axially 160 metres by
80 metres. Another large one consists of an enclosure 140 metres in length and
100 metres in width within two palisades spaced up to 18 metres apart. A more
elaborate structure found in this way is provided with an inner pair, 2 metres
apart, which are in turn covered by an outer pair lying 5 metres apart. This