| 摘要 |
The viewer has a central horizontal mirror (6) fixed to the upper surface of a rectangular support. Two mobile mirrors (11, 12) are articulated on the ends of the support, on either side of the central mirror. The lower surface of the support has two edges which project downwards and rest over the edge of a bath. Between the edges of the support there is a space (21) which extends all along it. Two pairs of bars (22) pivot on the support and rest on the edge of the bath. Their height and inclination is variable.
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