Original: 77 , Issue 1 ( 1995 ) , pp.1-30 ( 8 ) Made of six to twelve sails covered in reed matting or cloth material , these windmills were used to grind corn or draw up water , and were quite different from the later European horizontal-axis versions .
Simplified: 77 , Issue 1 ( 1995 ) , pp.1-30 ( 8 ) Made of six to twelve sails covered in reed matting or cloth , these windmills were used to grind corn or draw up water , they were quite different from the European versions .