tenshiogurahuitsuku dorotsupuhetsudo has the spherical drop hanging edge (20) the terminal surface which it has (18) the substance of the quartz which it possesses (10). The liquid supply hole (14), this internal, the extending being present and the outer part edge it hangs in order to supply the liquid to the terminal surface and the edge (20) from the drop which hangs (32) is formed. At least in order two optical guides (26 and 28), respectively, to send light to drop, and from drop in order to gather the light which inside is reflected, extending it is present to this internal. In order for strength of the light which is reflected to have remarkable secondary reflected peak, it guides, it hangs optically and the terminal in the upper part of the plane surface which includes the edge.
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