 Advances in the natural sciences put culture in a new perspective; for instance, building techniques improved, the use of the wood-burning cocklestove and glass windows became more common.Also the design of fortifications (often combined with ideas about town planning and architectural design) was at the cutting-edge of warfare technology, with fortifications officers travelling to central Europe to follow new precedents.From 1776 onward, the drawings of all public buildings had to be sent for building approval and review in Stockholm, and new statutes were introduced to prevent fires, so typical for wooden towns.