Inclinometry was done as follows :

    Datasets  El Dirn     HST     mean leg temperatures   Humidity
                          start     start   middle   end       %
  ( 20020817  90  cw      03:01      3.6      3.6    3.6      65 
    20020824  90  cw      21:39      8.5      8.2    7.7      90 )
    20020904  90  cw      21:06      7.5      6.9    6.6      80
    20020905  90  cw      01:41      6.0      5.5    5.3      65  

The carousel main doors were closed during 20020904 and open for 20020905. The temperature data from the fixed TMU inclinometer are OK, so the new data are temperature-corrected in the usual way. The resulting models are compared with each other and with the previous model (of the 17th) below :

• There are weak (1") signs of 'spikes' in the 20020904-20020817 difference plot (left) - again perhaps as a result of the higher temperatures during these new data. However, the 20020905-20020904 differences (right) are very small and free from such effects : either both data contain spikes of the same magnitude, or the premise that the data of 20020817 are free from them is incorrect.

• The formal differences in (F1,F2,F3) are described by the rms scatters of (0.46", 0.22", 0.24") and (0.20", 0.15", 0.27"), resp. c.f. (0.54", 0.23", 0.50") previously.

• Updates have been made to the plots of symmetry and strain gauge data. All looks OK.

• The model of the 17th is left in place, since
  • the changes seen are small
  • the temperature prevailing for on the 17th is closer to normal observing temperatures
  • the interpretation still holds that the data of the 17th are free from spikes.

04 Sep 2002 the central bearing load was checked and found to be insignificantly different from its previous setting (DJS). Subsequent transit inclinometry showed a v.slight reduction in amplitude (3" to ~2.5") - no action was taken.