Victorian illustration to download showing the test firing of a 35-ton gun at Woolwich in 1871. The gun was nicknamed ‘the Woolwich Infant’. Using a pulley system, soldiers raise a test shot-bolt towards the muzzle of the gun, while others stand ready to ram it in place. More bolts lie on a pallet. The gun had a steel core with jackets of wrought iron. Each test shot-bolt weighed 700lb; test firings were made using various charges of gunpowder. With 100lb of powder, the bolt reached a speed of 1320ft per second, and sank 30ft into an earth butt.