In the north transept of the cathedral are the dials of an ancient and curious clock, believed to have been set up early in the reign of Edward III, although its movement has been renewed. It sounds the hours and the curfew on Great Peter, a ponderous bell in the tower above it. The peal of ten bells in the southern tower is the heaviest in England. At many points in Devonshire may be seen the ruins of monasteries, priories, and nunneries which were closed by order of Henry VIII. Almost all of them have suffered so severely from decay, or perhaps even more from having been used as quarries, that in a great many instances only a few fragments of ruin remain of what, in their time, were large and magnificent buildings. These monastic houses were originally founded as places to which people might retreat who wished to retire from the world, and to lead simple lives of holiness, benevolence, and poverty, serving God and benefiting their fellows. For a time the inmates did all these things. As long as they were poor they were a blessing to the countries where they lived. They preached to the people, they taught in schools, tended the poor and the sick, practised agriculture and many useful arts, such as the construction of clocks, keeping alive such learning as there was, and making beautiful manuscript copies of the Bible and of the works of classical writers which otherwise would have been lost. But when they grew rich they became idle, careless, and ignorant, and their lives too often a scandal to the world. Henry VIII, as the result of a commission which he sent round to enquire into their condition, decided to suppress them. The houses were closed, their inmates were scattered, their estates were sold for trifling sums or given to the king's favourites, while part of their vast wealth was used in founding grammar-schools. The richest monastic house in the county was the Cistercian Priory of Plympton, of which little now remains beyond the refectory and the kitchen. Of the Benedictine monastery of Tavistock, an establishment second in wealth only to Plympton, the gateway, a porch, and two towers alone are left. The remains of the Norbertine abbey of Torre consist chiefly of the refectory, a gate-house, and the fine building known as the Spanish Barn, from a tradition that Spanish prisoners of war were confined in it.