On August 10, 1950, the decision was made to use steel H-piling to support the foundation, foot lengths, 85 tons. The piling used was 12 inch BP 53# in 60 The bearing pressure value per pile was approximately At the time this piling was being installed at Eberiru, it had not been determined what the total loading would be on the 200 foot tower for the Ef experiment, In view of this, the AEC requested that a foundation similar to that at Eberiru be installed. The subcontractor finished fabrication of the tower on September 15, 1950, and the towers were shipped on that date to Oakland for overseas shipment, Although no requirements were placed as to torsional stability, tests on the finished towers indicated that a normal day's rotation due to wind and temperature was only 40 seconds of arc, A request was made to keep the tower's horizontal movement to plus or mims 1 inch at the 200 foot level during normal wind conditions, and the field tests indicated movement of only plus or mimus + inch. This movement was due primarily to temperature changes of the structural members as the relative position of the sun changed during the day. In addition to the vertical loading previously mentioned, the tower was designed to withstand a wind pressure of 30 pounds per square foot on twice the projected area of one face. Since most of the load produced in the tower legs was contributed by actual vertical loads rather than wind loads, the allowable stresses selected for design were more conservative than those used for the 300 foot tower design. The possible overload factor for this tower (approximately 100 per cent) was necessary because it was never fully known what the Users would require of the tower. ' User's sketches received in the fall of 1950 called for a leadlimonite concrete circular column 200 feet high extending from the base of the tower to the underside of the house at the top. Because the lead would flow under the heavy pressures involved, it was decided that flanged sections of welded steel casing would be employed to act as forms for the limonite concrete encasing the lead and also to restrain the lead from flowing. The original plan for installing the coax cable called for supporting a piece of 12 inch pipe, out of which one-third of the circunference had been cut, the full height of the tower. The cables would then be fitted into this shell. After all of the cables had been in- stalled, the other third of the pipe would be replaced and held secure by banding. The 2 foot diameter lead blocks were then to be placed to a height of approximately 124 feet, after which the 4 foot diameter steel casing was to be placed and the space between the lead and the casing was to be filled with limonite concrete. The lead was then to be placed for 124 feet more and the process repeated until the full height of 200 feet was reached. 5elhe