| 摘要 |
A viewer for slides useful in clinical testing. The viewer is particularly useful for viewing precipitates formed in optically transparent or translucent gels contained in transparent trays. It includes a base member having side walls, a cover plate and a mask spaced above the cover plate. The slide is placed between the mask and the upper surface of the cover plate. Means are provided defining an entrance pupil above the mask. The slide is illuminated from a light source within the base. Light passes through a slit in the cover plate from the source to the location in the gel where the precipitate is most likely to be present. The slit is however masked from the view of the user by the mask and entrance pupil. Thus, the precipitate is readily seen if present, since it diffuses the light from source. If it is absent, only a black field of view is seen, since the upper surface of the cover plate is blackened in the viewing area.
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