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| Great drain cleaned, looking north. Deep hole at right (east) side continues to north ... AMS Horizontal (normal) ... Great drain cleaned, looking north. Deep hole at right (east) side continues to north. |
| Middle drain to north of Building C, as cleared ... AMS north 2567 ... 31 May 1938 |
| West Branch of the Great Drain; the new course to the right, the old course to the left beneath Building C ... north Horizontal (normal) ... 1937 |
| Middle drain to north of Building C, as cleared ... north 2567 Horizontal (normal) ... 31 May 1938 |
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