It is common knowledge that a small drop of Liquid on an inclined solid surface has a tendency of sticking to the surface of solid. Experimental study on the apparent contact angle on the inclined surface and the shape of the drop is conducted. It is shown that the contact angle and the shape of the drop are expressed easily by a polynominal series without any complicated numerical calculation. It is 'confirmed that they do not depend on the material constant of the solid surface.
New wear testing method for thin films was proposed. A small amplitude (10 mm) oscillating sliding wear tester was combined with a contact microscope. The substrate thin film deposited on, was pressed on the prism surface of the contact microscope. When some area of thin films worn away, the image of real contact area with the microscope changed clear at that area. Therefore, the area thin films worn away was easily distinguished with the microscope. The sensitivity of this new method is high enough to examine the wear resistance of thin films thinner than 100 nm.