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The principles and detection of gravitational waves by resonant antennas are briefly discussed. But the main purpose of this short note is to compare the two geometries of resonant antennas, the well-known cylindrical to the spherical type. Some features of a two sphere observatory are also discussed.arXiv:gr-qc/9702016v1 fatcat:7435pvuof5g5jdtdynssxnikvy