Single (music) - Types. 1  Singles have been issued in various formats, including 7-inch (18 cm), 10-inch (25 cm), and 12-inch (30 cm) vinyl discs (usually playing at 45 rpm); 10-inch (25-cm) shellac discs (playing at 78 rpm); cassette, 8 and 12 cm (3- and 5-inch) CD singles and 7-inch (18 cm) plastic flexi discs.
Conwy Castle. Conwy Castle, a World Heritage Site, is a magnificent fortress in North Wales. Built by James Saint George for King Edward I, it has towered over the medieval town of Conwy ever since.onwy Castle. Conwy Castle, a World Heritage Site, is a magnificent fortress in North Wales. Built by James Saint George for King Edward I, it has towered over the medieval town of Conwy ever since.
Timber, one of the two materials from which motte and bailey castles were built (the other being earth), was perishable (rots) and, more importantly, vulnerable to fire.A more durable and resistant medium was required and that was provided by stone.astles were great defences against the enemy. However, when gunpowder was invented the castles stopped being an effective form of defence. By the end of the 1300s gunpowder was widely in use. The medieval castle with its high vertical walls was no longer the invincible fortification it had been.