The spinning wheel was most likely invented in the Islamic world by the early 11th century. There is evidence pointing to the spinning wheel being known in the Islamic world by 1030, and the earliest clear illustration of the spinning wheel is from Baghdad, drawn in 1237. Evidence also points to the spinning wheel reaching China by 1090, with the earliest clear Chinese illustration of the machine dated to around 1270. The spinning wheel then spread from the Islamic world to Europe and India by the 13th century, with the earliest European illustration dated to around 1280 and the earliest unambiguous Indian reference dated to 1350.C. Wayne Smith and J. Tom Cothren have claimed that the spinning wheel was invented in India between 500 and 1000.[5][6] However, this claim is disputed by the historians Arnold Pacey and Irfan Habib who note that early references to cotton spinning in India are vague and do not clearly identify a wheel, but more likely refer to hand spinning. The earliest unambiguous reference to a spinning wheel in India is dated to 1350, suggesting that the spinning wheel was introduced from Iran to India. In France, the spindle and distaff were not displaced until the mid 18th century.The spinning wheel replaced the earlier method of hand spinning with a spindle. The first stage in mechanizing the process was mounting the spindle horizontally so it could be rotated by a cord encircling a large, hand-driven wheel. The great wheel is an example of this type, where the fibre is held in the left hand and the wheel slowly turned with the right. Holding the fibre at a slight angle to the spindle produced the necessary twist. The spun yarn was then wound onto the spindle by moving it so as to form a right angle with the spindle. This type of wheel, while known in Europe by the 14th century, was not in general use until later. The construction of the Great Wheel made it very good at creating long drawn soft fuzzy wools, but very difficult to create the strong smooth yarns needed to create warp for weaving. Spinning wheels ultimately did not develop the capability to spin a variety of yarns until the beginning of the 19th century and the mechanization of spinning.In general, the spinning technology was known for a long time before being adopted by the majority of people, thus making it hard to fix dates of the improvements. In 1533, a citizen of Brunswick is said to have added a treadle, by which the spinner could rotate her spindle with one foot and have both hands free to spin. Leonardo da Vinci drew a picture of the flyer, which twists the yarn before winding it onto the spindle. During the 16th century a treadle wheel with flyer was in common use, and gained such names as the Saxony wheel and the flax wheel. It sped up production, as one needn't stop spinning to wind up the yarn.