Measures to secure a patent for an improvement in Windmills have been taken by A. Osborn, of Albany, N. Y. This improvement is intended to facilitate the construction of the wings or sails so as to give them the proper curve. Practice has proved that the wings, where they join the centre or hub, should have an angle of about 20, and the outer ends of the wings an angle of about 7, a gradual curve following the length of the wings. The inventor obtains the desired form by using two circular rods, which are placed one on each side of the sails or wings, and near their outer edges ; these rods are connected by clamps or adjustable screws, so as to be brought nearer to each other, air required. These ' rods also serve as a fly or balance to the wings.