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			 Member 
			
			
			
				
			
			Join Date: Jan 2006 
				Location: Kent 
				
				
					Posts: 2,658
				 
				
				
				
				
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			Hi Bill, 
		
		
		
			the magnified images are really interesting    There seems to be crystaline 'structures' (ringed in photo) in the blade .... any idea what they could be David .  | 
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		#2 | ||
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			Join Date: Mar 2005 
				Location: USA Georgia 
				
				
					Posts: 1,599
				 
				
				
				
				
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			 Quote: 
	
 I will look deeper with higher magnification. and try some different angles. Quote: 
	
 Norman, you are perfectly welcome to use the images anyt way you like! I want to try some more images at different angles and using fiberoptic ringlight as well as the dual goosenecks. I don't think there is an inverted "T." It looks like it is mainly just a groove with the metal pounded in as you suggested. Bill  | 
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