A device has been designed for the transfer and rotation of single crystals so that angular dependent ESR data can be obtained with a stationary magnet and rectangular cavity. The apparatus consists of a modified Donnay optical analyzer and a second goniometer which is rotated about a vertical axis in the ESR instrument. It has been possible to transfer crystals within ±0.5° of the desired orientation. Measurements of effectivegvalues on two systems yielded standard deviations of 0.001 or less.