Four à rougir les boulets à la pointe du Roc
MonumentHidden Treasure
Four à rougir les boulets à la pointe du Roc, located in Granville (Manche), is a Renaissance château built in the 16th century. The monument is currently closed to visitors.
Key facts
- Type
- autre
- Period
- Renaissance (16th century)
- Location
- Granville, Manche, Normandie
- Visit
- Closed to visitors
- GPS
- 48.8335, -1.6110
- Mérimée Reference
- PA00110419
At the end of Granville's granite peninsula, this eighteenth-century cannonball oven epitomises the ingenuity of French coastal defence - a rare military relic that has been listed as a Historic Monument.
History
Nestling on the Pointe du Roc, this ball-reddening furnace is one of the most authentic examples of 18th-century coastal artillery still in place on the Normandy coast. Discreet at first glance, this small stone building actually reveals a remarkable technical sophistication at the service of a formidable military strategy: heating cannonballs to white heat to set fire to the wooden hulls of enemy ships. What makes this monument truly unique is its rare state of preservation. The furnaces used to red-hot cannonballs often disappeared, dismantled or reassigned after the Napoleonic wars. The one in Granville, possibly built to the "Fourcroy" model of 1788, has survived intact, with its large barrel-vaulted room and access corridor to the heating chamber. The precise operation of a device designed to transform heat into a weapon can still be read in the stone. The tour plunges visitors into the very real world of the coastal artillerymen of the Age of Enlightenment. The interior, sober and austere, speaks for itself: the thickness of the vaults, the cleverly-directed openings and the logical circulation between spaces all bear witness to an architecture entirely dedicated to military efficiency. It's easy to imagine the room servants, sweating in the heat of the embers, handling the red-hot cannonballs with iron tongs. The outdoor setting reinforces the emotion of the place. Perched on the granite headland of Granville, the kiln enjoys a breathtaking panorama over the bay of La Manche, the Chausey islands and, on a clear day, the silhouette of Mont-Saint-Michel on the horizon. The sea breeze, the low-angled light on the granite and the proximity of the Saint-Pair guardhouse make up a defensive complex of great historical coherence. Listed as a Historic Monument since 1987, the Granville Cannonball Oven is a must-see for anyone interested in military history, the utilitarian architecture of the Ancien Régime or simply the rugged beauty of the Granville coast.
Architecture
The ball-reddening furnace at Pointe du Roc belongs to the category of casemate reverberatory furnaces, designed to maximise the rise in temperature of the balls while protecting the servants from enemy fire. The building, built entirely of local granite, is divided into two complementary areas: a large barrel-vaulted main room, facing east-west, and a small rectangular vaulted room accessible via a side corridor. The large room opens to the south through a door with a slightly arched lintel - a measured opening designed to allow the servants to move around without weakening the protective mass of the vault. To the west, a large arched opening, which was partially walled off during a later refurbishment, provided ventilation and evacuation of combustion fumes, while also allowing access to the loading device for heated cannonballs to the surrounding artillery pieces. The barrel vault is the most remarkable architectural feature: made of carefully cut granite, it bears witness to a high level of military masonry skills, capable of withstanding both the intense heat generated by combustion and the vibrations of the fire from nearby batteries. The Fourcroy model, to which this oven is possibly related, favoured this vaulted shape to concentrate and reverberate the heat towards the cannonballs placed on iron grates, thus optimising the duration and uniformity of the heating.
Related Figures
Fourcroy (ingénieur militaire, concepteur du modèle de four à réverbère de casemate, 1788)Vauban (Sébastien Le Prestre de Vauban, inspirateur de la doctrine de fortification côtière française)Louis XVI (sous le règne duquel la modernisation des défenses côtières fut engagée)Les artilleurs de la garnison de Granville (servants anonymes des batteries côtières sous la Révolution et l'Empire)
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Frequently Asked Questions
Where is Four à rougir les boulets à la pointe du Roc located?
Four à rougir les boulets à la pointe du Roc is located in Granville, Manche department, Normandie region, France.
When was Four à rougir les boulets à la pointe du Roc built?
Four à rougir les boulets à la pointe du Roc dates back to a period built during the Renaissance (16th century).
Is Four à rougir les boulets à la pointe du Roc open to visitors?
Four à rougir les boulets à la pointe du Roc is currently closed to visitors.