Inge,

My guess is a grainy SEM image.  Indeed the "gun"  looks like "Big Bertha".

Drew Meyer
Benchmark Electronics, Inc.

Although the name was commonly applied to a whole variety of large-calibre 
German artillery guns the "Big Bertha" ('Dicke Berta') actually referred to a 
single siege gun, at that time the world's largest and most powerful.

Produced by the German firm of Krupp the Big Bertha was a 42cm howitzer, 
model L/14 designed in the aftermath of the Russo-Japanese War of 1904 on 
behalf of the German Army.  It was initially used as a means of (successfully) 
demolishing the fortress towns of Liege and Namur in August 1914, the war's 
first month (and subsequently as Antwerp).  It was thereafter used to similarly 
reduce other enemy strong-points as the need arose.

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