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A resume extracted from an article posted in "The Cellar" ...

Jaigarh Fort is located on a hill called the Cheel Ka Teela, looking over the Amer Palace. It once held the treasures of the royal family of the Maharaja of Jaipur. It is the only fort in India that houses its own cannon factory. The art of cannon making was brought to India by the Mughals. The Maharaja of Jaipur, having collaborated with the Mughals, learned cannon making and built a cannon factory at Jaigarh.
This factory has produced some massive cannons, of which the most famous one is Jaivana - the largest wheeled cannon in the world! Jaivana was cast and forged in 1720 in the Jaigarh fort itself. The barrel has floral design. An elephant rests on the tip of the barrel and a pair of peacocks are carved in the center. The two thick rings on the barrel were used for lifting it with the help of a crane which, though incomplete, is still lying in Jaigarh. A pair of ducks also decorates the rear of the barrel. The barrel of the cannon weighs 50 tonnes. The carriage weighs a lot more! It is said that it took four elephants to turn the cannon around.The length of the cannon barrel is 6.15 mts. The diameter of the bore of the barrel is 28 cm and the thickness of the barrel at the tip is 21.6 cm. Jaivan rests on a high two-wheeled carriage. The wheels are 1.37 m in diameter. The carriage is equipped with two removable additional wheels for transport. The removable wheels are 2.74 m in diameter. About 100 kg of gunpowder fired a shot ball weighing 50 kg. The Jaivana Cannon was only fired once by the Jai Singh II, as a test-fire in 1720. The most exaggerated myth claims that the weapon had a range of 40 km, other sources say it is 35, 22 and 11 km, although the exact range could perhaps never be determined. After studies on the period ballistics,the highest probably muzzle velocity would be around 1500 to 1700 feet/second. This would give a maximum ballistic range of around 5000 yards to 3 miles.
Regarding this, i have a narration that an Indian cannon, way larger than this one, was dismantled in Goa by order of the Portuguese Vice-Roy in 1848, to be minted in bronze coins, which at the time were missing for chance money, thus over inflating the value silver coins.

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