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Confirmation of track model of 970819.Richard Prestage described recently the actions following the central bearing load adjustment of 970819; viz, the inclinometry and reduction thereof, and the installation of the resulting track model. I present below a plot showing the difference between this model and the previous one :
Richard's concerns about the large (5") excursions in this plot may abate when this plot is compared with a similar plot showing the change in the model following the central bearing adjustment of 960401 (which is the most recent c.b. load adjustment of which I am aware) :
The differences have a different functional form but were presumably just as worrying at that time as the new ones might be now. I shall endeavour to obtain another set of inclinometry to confirm the data of 970819.
970914
The excursions are much less than those above, (1-2") maybe, and are probably a result of a difference in temperature : the mean leg temperature during the 970819 data was 9.2C (!!) whereas that during the 970914 data was 4.9C - still susprisingly warm, but a lot nearer to normal nighttime temperatures. The new track model, model1-970915.dat has been installed Iain Coulson 15 September 1997 |
