Poor weather allowd us to gather 2 CW and one CCW runs with the fixed TMU inclinometer.

    Datasets El Dirn     HST     mean leg temperatures   Humidity
                        start      start   middle   end       %
  ( 20011218 90 cw       15:00      7.5      8.0    8.0      40 )
    20020113 90 cw       10:53      3.0      4.5    6.0      35
    20020113 90 cw       18:31      8.0      7.3    7.0      45
    20020113 90 ccw      23:05      6.4      5.9    5.5      35

• The new data at are again of full amplitude - i.e. showing no sign of the 'small-amplitude' syndrome captured on 17 Oct.

• The difference between the model resulting from the new daytime CW data and those from 18 Dec is shown below :
  

• The formal differences in (F1,F2,F3) between these data are described by the rms scatters of (0.54", 0.40", 0.74").

• The difference between the model resulting from the nighttime CW data and the daytime CW data is shown below :
  

• The formal differences in (F1,F2,F3) between these data are described by the rms scatters of (0.22", 0.22", 0.13").

• The difference between the model resulting from the nighttime CW and CCW data is shown below :
  

• The formal differences in (F1,F2,F3) between these data are described by the rms scatters of (1.24", 0.33", 0.34").

  This CW-CCW difference is very similar to that seen the last time consecutive CW & CCW data were taken, viz. on 17 July 2000.

• The data seem of excellent quality and the similarity between the clockwise datasets suggests that the intrinsic contribution of inclinometry errors to the pointing budget is 0.5" or less.

• The new (nighttime CW) model was installed at 11:05 HST 17 Jan 2002.

• The data were also analysed for symmetry properties - the time line of these data shows normal behaviour in the symmetry since the CBLA on 18 Dec 2001.

• Strain Gauge measures
  The inclinometry data stream includes readings from the (2) strain gauges buried in the plinth wall. The new measures are added to the graphical record.

I thank the JCMT TSSs for their continued contributions to this never-ending program of data collection. Their enthusiasm for this most tedious and time-consuming of observatory tasks is a source of inspiration.