who has been closely associated with the.prestressing work, and Mr D. J. Coats, B.Sc., A.M.I.C.E., the Resident Engineer for the Allt-na-Lairige Scheme. DiscussionThe Author introduced the Paper with the aid of a series of lantern slides and a film. He described the method adopted to observe deflexions of the dam which had been referred to in $ 5 5 and gave particulars of records of deflexion during prestressing of the dam and reservoir impounding obtained since the Paper had been prepared.62. The method of observing deflexions was illustrated in Fig. 19. A telescope, removed eom a dumpy level, had been rigidly mounted at the top of the dam to sight on a viewing plate fixed to the downstream face of the dam near to the base. Since deflexion of the dam would be accompanied by a rotation movement, a sensitive spirit level, graduated to read 24 sec of angle to each division on the bubble scale, had been fixed adjacent to the telescope as a means of measuring the degree of rotation. A protective wooden box had been mounted over the telescope and level and removed only when readings were being taken.63. The graph plotted in Fig. 20 showed the actual deflexions after correction for rotation. The maximum deflexion observed as a result of the prestress load was just over 0.2 in. in an upstream direction. During a period of 11 weeks until impounding commenced the deflexion decreased to 0.1 in., but it had been observed that the deflexion was almost continually changing owing to atmospheric conditions and temperature and the recorded points marking observations subsequent to prestressing might not necessarily have covered all of the variations that occurred. Conditions with the dam empty were indicated by the broken line and conditions during impounding by the full line. The slight increase after impounding commenced could be attributed to temperature change. When the reservoir had been filled to overflow level the deflexion in an upstream direction due to the prestress load had been almost exactly counterbalanced and the overall results confirmed what was anticipated in prior calculations when the dam had been designed.
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