View of the back wall ... AMS south 3300 Horizontal (normal) ... 27 Jul 1961
Deep central basin: detail of the northwest corner, showing outlet pipe ... AMS northwest 3304 Horizontal (normal) ... 27 Jul 1961
View of the deep central basin, showing trace of overflow pipe ... AMS south 3302 Horizontal (normal) ... 18 Jul 1961
Earlier outlet of deep central basin, as cleared. The plaster used to block it still remains in left half. At right, later outlet ... AMS south 3306 Horizontal (normal) ... 27 Jul 1961
