It is frequently essential for a transducer to have a smooth, wide-beam directivity pattern with negligible side lobes. If, in addition, this transducer must operate in the fractional megacycle frequency region, then conventional designs such as small plane radiators or curved surface mosaics are not satisfactory. As a result of an extensive investigation, it was found that a barium titanate spherical shell sector properly designed will meet these difficult wide-pattern and high frequency specifications. This paper outlines some of the design considerations required to adapt a ceramic shell into a transducer with the desired performance. The problems discussed are shell size, included angle of the spherical shell, inside diameter to thickness ratio, and the uniformity of the thickness dimension. Various baffle techniques are also examined detail. Shell arc lengths ranging from four to twenty wavelengths are considered as to their effects on the shape of the surface displacement distribution and on the directivity pattern. Though this paper presents a solution to a specific transducer problem, the design techniques discussed are applicable to transducers having other frequency and pattern requirements.