qsy-complains-a-lot:

De Bange Mle 1877 long cannon

Manufactured in France c.1877 on to the late 19th century, designed by Charles Ragon de Bange.
155mm single shot breech loaded, rifled barrel.

Designed following the Franco-Prussian war, this cannon used the revolutionary de Bange gas seal system using a grease-soaked asbestos patch compressed by the firing process to seal the breech.

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Although obsolete and mostly a fortress gun by World War 1, the Mle 1877 still saw use during the conflict because of course it did.

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