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10. INDEX OF A QUADRANT

This index is at present used as a wedge in astrolabe no.3; but actually it belongs to a quadrant, which is no more available. It has a length of 135 mm and a width of 8 mm. it is graduated in degrees and in groups of 60 and is labelled in abjad notation from 6 to 60 in forward and backward directions.

   

 

 

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