Crowmarsh Gifford Norman. A north transept with a pointed arch was added in about 1200. The building was restored in 1836 and 1868. In 1139 King Stephen built a wooden fort in Crowmarsh, the first of a series built in opposition to Wallingford Castle, which supported his cousin Matilda during the civil war known as The Anarchy. The forts were probably dismantled as a result of the Treaty of Wallingford of 1153. The castle at Crowmarsh consisted of a wide ditch surrounding an enclosure measuring . In 1701 agriculturist Jethro Tull invented his revolutionary seed drill here. In 1770 nearby Mongewell Park
Hammer drill the special "hammer clutch," turning the tool into a conventional drill for wood or metal work. Hammer drills are more expensive and more bulky than regular drills, but are preferable for applications where the material to be drilled—concrete block or wood studs—is unknown. For example, an electrician mounting an electrical box to a wall would be able to use the same hammer drill to drill into either wood studs (hammer disabled) or masonry walls (hammer enabled). 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