A Windsor chair is a chair built with a solid wooden seat into which the chair-back and legs are round-tenoned, or pushed into drilled holes, in contrast to standard chairs, where the back legs and the uprights of the back are continuous. The seats of Windsor chairs were often carved into a shallow dish or saddle shape for comfort. Traditionally, the legs and uprights were usually turned on a pole lathe. The back and sometimes the arm pieces (if arms are present) are formed from steam bent pieces of wood. It is not clear when the first Windsor Chairs were made. It is known that, as early as the 16th century, wheelwrights started coping out chair spindles in the same way they made wheel spokes. The design was probably a development of West Country, Welsh and Irish 'stick-back' chairs, but the evidence on origin is not certain. It is thought that the first Windsor chair made its appearance in the county of Buckinghamshire, where the main centre of production eventually moved to High Wycombe. The first Windsors were of the comb-back variety. By the 18th century steam-bending was being used to produce the characteristic "bow" of the Windsor chair. The first chairs made this way were shipped to London from the market town of Windsor, Berkshire in 1724.