The stone mill is two pieces of stone close to the top and bottom, the size of its different, the food by the rotation of the stone and grinding into fine powder for the purpose of the instrument. It is wrong to assume that there is only one type of stone mill. Since the Ming and Ching Dynasties, Taiwanese ancestors have used various kinds of stone mills to process and prepare food according to their needs. If the use of "human power", "animal power" to distinguish, can be divided into oxen and manpower mill, the former, as the name suggests, that is, oxen pulling the mill, the mill's shape of the volume of large to grind flour, rice bran, soybean meal in larger quantities for trading; the latter is generally known as "stone mill boy", to manpower to pull the hook of the stone mill rotating stone mill on the upper seat, in order to grind rice paddles for kuey teow based. In terms of the differentiation of grinding items, they can be categorized into flour mills, bean mills, kuey teow mills, and cake and bran mills, and their shapes and forms vary according to their uses.

In ancient times, the object for grinding things consisted of two cylinders and a stick. e.g. crushed soybeans

Ref: me

Ancient blender. (Larger and manually powered, and available in different sizes) Google and Yahoo for pictures