219
transduction matching local scale application calibration
→
→
→
m mapping
and
matching
public scale application
→
This diagram reveals some symmetries in the conceptual structure of direct measurement according to the model we are proposing:
• There are a local scale and a public scale, connected by calibration (Fig. 7.14).
19
19 As noted above, and illustrated in Sect. 7.3.3 and in particular in Fig. 7.12, significant parts of this
figure and the next two are absent in the case of direct comparisons with reference objects.
Fig. 7.14 First symmetry in the Hexagon Framework: local scale and public scale
Fig. 7.15 Second symmetry in the Hexagon Framework: transduction and calibration
7.3 A structural model of direct measurement