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In order to ascertain the exact location of the old house it was decided that a datum point would need to be established to which all further measurements and orientation could be related. As a cross-reference it was also felt that it would be useful to employ landmarks that existed both at the time and which are still visible on maps of the area as it currently stands. From a study of the available maps it was concluded that the critical datum point to establish was that defining the exact location of the southwestern tip of the old house plot as it was when the house was still standing as this could still be accurately observed on later maps once the house itself had been demolished and by which time a metric Ordnance Survey (OS) mapping system was in use such as those at the scale 1:1250. This meant that a reference point could be established on a contemporary map and, with a knowledge of the size and orientation of the old house from earlier plans and utilising other corroborating methods, the exact position could be determined.
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