What did Germain Sommeiller invent in 1887?

Germain Sommeiller invented the compressed air drill in 1887, which was a significant advancement in the field of tunneling and mining. This device used compressed air to power the drilling mechanism, allowing for more efficient and effective excavation of rock and other materials. The invention of the compressed air drill revolutionized construction and mining operations, enabling workers to bore through hard rock much more quickly than manual methods or prior mechanical devices, thus accelerating project timelines and reducing labor costs. Sommeiller's innovation laid the groundwork for the widespread use of pneumatic tools in various industries, marking a pivotal moment in engineering and technology.