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The electron transmission through a {\it closed} Aharonov-Bohm mesoscopicsolid-state interferometer, with a quantum dot (QD) on one of the paths, iscalculated exactly for a simple model. Although the conductance is an evenfunction of the magnetic flux (due to Onsager's relations), in many cases onecan use the measured conductance to extract both the amplitude and the phase ofthe "intrinsic" transmission amplitude $t_D=-i|t_D|e^{i\alpha_D}$ through the"bare" QD. We also propose to compare this indirect measurement with the(hitherto untested) direct relation $\sin^2(\alpha_D) \equiv|t_D|^2/\max(|t_D|^2)$.Comment: Phys. Rev. Lett. (in press

Measuring the Transmission Phase of a Quantum Dot in a Closed Interferometer