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Text File  |  1997-10-28  |  266b  |  11 lines
  1.  
  2. RODENSTOCK OPHTHALMOMETER
  3.  
  4. MAKING THE MEASUREMENT
  5.  
  6. The axis is read from the axis scale around the tube  body.
  7.  
  8. The other major meridian is measured by rotating the instrument 90 degrees and repeating the measurement.
  9.  
  10. **show scale; ** rotated 90 degrees
  11.