| 摘要 |
A microscope having a first mirror located below its stage, such mirror being rotatable and bodily shiftable to selected positions to reflect light at various angles with respect to the optical axis so as to provide for various degrees of dark-field illumination of a specimen on the stage. Said mirror is also shiftable to a position to reflect light coincident with the optical axis to provide for bright-field illumination. This mirror has a mounting which is slidable within a horizontal slot in a side wall of the base of the microscope, the mounting permitting rotation of the mirror at any position along the slot. A second mirror, which may be used to spotlight the specimen being examined, is carried by a mounting block on which the lens body is supported, the block being vertically movable for the purpose of focusing the lens system. The second mirror is pivotal about a horizontally-disposed axis and adapted to reflect rays from a light source onto a specimen on the stage. The first mirror may be shifted to a position wherein it limits light rays only in a direction toward the second mirror.
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