NEW OPTICAL POSITIONS OF THE GLOBULAR-CLUSTER X-RAY SOURCES NGC-6712-S X-1850-086 AND M-15-AC211 X-2127+119

Positions of the candidates for the optical counterpart of the X-ray s ource in the globular cluster NGC 6712 have been determined using phot ographic plates, image tube films, and CCD and Photon-Counting-Camera frames. The positions were determined with respect to meridian circle observations and the PPM catalogue. The small differences of the order of 0.1'' between our positions of the star called S by Nieto et al. ( 1990) and the radio position of Machin et al. (1990) confirm earlier s uggestions that this star is indeed the optical counterpart of the X-r ay source in NGC 6712. In addition, a new optical position of the X-ra y source M 15:AC211/X2127+119 is given.