Paris Gun
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The Paris Gun was the name given to a type of German long-range siege gun, several of which were used to bombard Paris during World War I. They were in service from March to August 1918. Wikipedia
Breech: horizontal sliding-block
Caliber: 211 mm (8.3 in), later rebored to 238 mm (9.4 in)
Designer: Dr. Fritz Rausenberger
Elevation: 55 degrees
Length: 34 m (111 ft 7 in): 84
Manufacturer: Krupp
Mass: 256 t (252 long tons; 282 short tons)