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Message ID: 3027     Entry time: Tue Jun 1 18:39:59 2010
Author: Nancy 
Type: Update 
Category:  
Subject: Lead spheres for the seismographs 

 

the lead spheres that were placed below the granite slab have been flattened by hammering to have lesser degree of wobbling of the slab.

the height of each piece, and the flatness of their surfaces was checked by placing another slab over them and checking by the spirit level.

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P6010166.JPG

P6010164.JPG

 

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