Jahan Kosha Cannon
The cannon was made in 1637 CE by Janardan Karmakar, a Hindu blacksmith and gunsmith, under the supervision of Hara Ballav Das.
The cannon is made of ashtadhatu or 8 metals, namely lead, iron, silver, copper, tin, zinc, gold and mercury. Ashtadhatu, also called octo-alloy, is a mix of alloy often used for casting metallic idols in Hindu temples. The composition is laid down in the Shilpa shastras, a collection of ancient texts that describe arts, crafts, and their design rules, principles and standards.
The cannon is more than 7 tons in weight. It is 17 feet and 6 inches in length and 3 feet in width. It has a girth of 5 feet at the touch hole end. The circumference of its mouth is more than one foot. The radius of the touch hole is one and a half inches. In order to fire this cannon once, 17 kilograms of gunpowder was needed. The bore is approximately 6 inches.
The wheels of the gun carriage have disappeared, but the iron-work of the carriage and the trunions are still visible.
The cannon is maintained by the Archaeological Survey of India.
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