effectively the world's first "fire bomb" The workshop was one of the world's earliest oil refining factories where thousands of people worked to produce Chinese oil powered weaponry. Oil well: The earliest record of an oil well dates from 347 AD in China. Petroleum was used in ancient China for "lighting, as a lubricant for cart axles and the bearings of water-powered drop hammers, as a source of carbon for inksticks, and as a medical remedy for sores on humans and mange in animals." The earliest illustrated depiction of an oil well dates to 1762 AD. P Paper cup and paper napkin: Paper cups have been documented in imperial China, alongside paper napkins. Paper cups were known as chih pei and were used for the serving of tea. They were constructed in different sizes and colors, and were adorned with decorative designs. Paper napkins, or chih pha, accompanied tea cups and were folded into squares. Textual evidence of paper cups and napkins appears in a description of the possessions of the Yu family, from the city of Hangzhou. Paper lantern: The paper lantern is a lighting device made of paper. Early lanterns in China were constructed with silk, paper, or animal skin with frames made of bamboo or wood. One of the earliest descriptions of paper lanterns is found in records from Khotan, which describe a "mounting lantern" made of white paper. Percussion drilling: Ancient China's principal drilling technique, percussive drilling, was invented during the Han dynasty. The process involved two to six men jumping on a level at rhythmic intervals to raise a heavy iron bit attached to long bamboo cables from a bamboo derrick. Utilizing cast iron bits and tools constructed of bamboo, the early Chinese were able to percussion drilling to drill holes to a depth of 3000 ft. The construction of percussion drilling machines took more than two to three generations of workers. The cable tool drilling machines developed by the early Chinese involved raising and dropping a heavy string of drilling tools to crush through rocks into diminutive fragments. In addition, the Chinese also used a cutting head secured to bamboo rods to drill to depths of 915 m. The raising and dropping of the bamboo drill strings allowed the drilling machine penetrate less denser and unconsolidated rock formations. Petroleum as fuel: The use of petroleum dates back to ancient China more than 2000 years