Something doesn`t seem right with that detail, I`m afraid. This is a copy of a text I am working on. It clearly implies that `Court` had been employed in the technical side of the French artillery for some considerable time and was skilled in casting cannon and producing shells, which were first demonstrated in 1787 in Gibraltar.
The brief bio, which you kindly provided, seems to be from another Court. Can it be that two Courts ended up in Ranjit Sigh`s service?

`Maharaja Ranjit Singh gave Court employment in the artillery `befitting his talents and scientific attainments`. Court was responsible for the training of artillerymen, the organization of batteries and the establishment of arsenals and magazines on European lines.
The Maharaja had his own foundry for casting guns and for the manufacture of shells. Court supervised these in collaboration with Sardar Lahina Singh Majithia.
When Court produced the first shell at the Lahore foundry, the Maharaja bestowed upon him a reward of Rs 30,000, and when he produced the fuse, he was rewarded with an award of Rs 5,000. Court received a salary of Rs 2,500 per month, besides a grant of land, or jagir. `