  The wedge geometry closed by a circular-cylindrical arc is a nontrivial
generalization of the cylinder, which may have various applications. If the
radial boundaries are not perfect conductors, the angular eigenvalues are only
implicitly determined. When the speed of light is the same on both sides of the
wedge, the Casimir energy is finite, unlike the case of a perfect conductor,
where there is a divergence associated with the corners where the radial planes
meet the circular arc. We advance the study of this system by reporting results
on the temperature dependence for the conducting situation. We also discuss the
appropriate choice of the electromagnetic energy-momentum tensor.
