As a part of the Wave Energy Program of the Ocean Engineering Centre, Indian Institute of Technology, Madras (India), theoretical and experimental investigations are in progress to obtain the necessary data to design an optimum Oscillating Water Column (OWC) Device for exploitation of Wave Energy. This paper presents the experimental results on two different geometries of the device. The results show the influence of the ratio 'Wave Length to the Device Length and the damping on the device efficiency indicated by the capture factor.