| 摘要 |
The appliance (1) has a first circular recess (20) with smaller diameter and is deeper than a second (20'). An oblong slot (21) deeper than the recesses facilitates the insertion of a disc into the support system so formed. Knobs (5,5') sliding in guide channels (3,3') adjust the position of crosswires (8,8') against scales (10,10'). Discs, after treatment which renders fluorescent accumulations of residual matter, are placed in the appliance and the crosswires adjusted to provide x-y coordinates of their position
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