It also adds stability, it is possible that it was made for a boat or barge. The narrow neck would help guard against spillage.
Antique Arts & Crafts Movement Hammered Copper & Brass Hot Water Tankard c.1900
ANTIQUE ARTS & CRAFTS VINTAGE LARGE COPPER KETTLE BRASS HANDLE 1800s KITCHENALIA
Large Antique Arts & Crafts Artisan Made Copper Kettle
Arts crafts movement period copper plate
Arts & Crafts Cubist Design Copper Kettle, 1910s
Antique 19th Century Arts & Crafts Movement Carved Golden Oak Occasional Table