Photos

this is claimed to be world's largest cannon on wheels located at Jaigarh Fort, near Jaipur, Rajasthan....to imagine its mammoth size please see if u can locate a pair of legs in background between the wheels...also note the part of table in right corner...

History if cannon goes like this...collected from various sites on net

Chiefly constructed for defense purposes, the Jaigarh Fort is a huge moated castle containing all the gadgets of a full-fledged citadel. One of the exigent charms of this majestic fort is the world's largest cannon on wheels, the Jaivan. Weighing 50 tons,, it has a 20-foot-long barrel, its wheels are 9 feet in diameter and it took 100 kg of gunpowder to fire a single shot...Such was its might that it took four elephants to swivel it around on its axis. But surprisingly (and thankfully!) it was never used. Despite its awesome firepower, it has a delicate scrollwork of birds, foliage and a roaring elephant at its mouth. Jaivan was test-fired once by Jai Singh in 1720 when the cannon ball landed at Chaksu about 38km away! and the impact of it was so enormous that a lake formed at the spot and many houses collapsed in Jaipur. The cannoneer died immediately after the firing, before he could even jump into water. (It is mandatory for the cannoneer to jump into water to avoid the massive impact, and so there's always a water tank beside the cannon.) No wonder enemies didn't ever set their eyes on Jaigarh. There's even a notice here which proudly says, "because of the strong defence system, management and the foresightedness of the rulers, the enemy never dared to enter the fort."