SUMMARY
CW & CCW Inclinometry was taken during poor weather 21-23 May 1999, although for various reasons the data are not entirely useable.

   Datasets     HST start      mean leg temperatures   Humidity
                               start   middle   end       %
 ( inc990521      02:54         1.8     2.2     2.3      20 )
   inc990522cw1   20:24 21st    6.8     6.3     5.6      50
   inc990522ccw   23:38 21st    5.5     5.0     4.4      55
   inc990522cw2   02:45         4.0     3.5     3.0      55
   inc990523      07:33         2.0     2.2     2.8      55
   inc990523b     12:54         4.0     4.8     5.5      45  

Differences between the various clockwise models are shown below :

• inc990522cw1 was started too early - see the rapid settling still visible in the F3 results
• inc990522cw2 has extreme noise in the middle - cause unknown at this stage
• the first run on 990523 seems good - the rms scatters in the (F1,F2,F3) difference 990523-990521 are are, respectively : (0.29", 0.16", 0.47").
• the second run on 990523 may be showing temperature effects already.
• A new track model based on the first run on 990523 was installed at 13:00 HST on 19990524.

Symmetry
Only the dataset inc990523 is used to add to the symmetry database, although the 990522 data are used tentativelt to add to the CW-CCW data below.

On this basis, the symmetry remains good (see the plot ).

CW-CCW
The difference between the first cw run on 990522 and the ccw run is shown below :

Apart from the initial settling problem, this looks very similar to the last CW-CCW taken, viz on 990516. The difference between these two CW-CCW differences is shown below :

We add the CCW data to the database started on 990512 ,

      dataset       scatter about the best-fit str line to
                    Ch2 -vs- Ch8   Ch5(phase-flipped) -vs- Ch8
               i.e.  TY -vs- RY     LY(phase-flipped) -vs- RY
    ------------     ----------     -------------------------
    inc971031cw         0.59"                 1.56"
    inc971031ccw        0.79                  2.37

    inc980820cw         0.76                  4.30
    inc980820ccw        0.74                  4.98

    inc990511cw         0.73"                 1.41"
    inc990511ccw        1.05                  1.87
    inc990512cw         0.72                  1.56

    inc990516cw         0.70                  1.65
    inc990516ccw        0.84                  1.68

    inc990521           0.66                  1.49
    inc990522cw1        0.91:                 1.52
    inc990522ccw        0.84                  1.72
    inc990522cw2        0.67                  1.55
    inc990523           0.74                  1.49

The CCW symmetry is always worse than the CW, but only marginally so.