What high-tech cultural relics did the Qing royal family collect?

Magar Ernie's uninvited firebird cannon. This gun was a gift to Emperor Qianlong when the British special envoy magal led a delegation to China in the 58th year of the Qing Dynasty (1793). The barrel and wooden bracket are engraved with patterns of golden flowers and creeping weeds, and various weapons patterns are embossed, such as shields, guns, knives, cannons, swords, axes, trumpets and so on. The trigger is embedded with a wooden bust of a soldier. Its common nails, belts and buttons are all decorated with gold.