The flag sampler (Fig. 13.3) consists of a 5 cm length of 2.5 cm wide transparent cellulose tape wrapped around a 5 cm long straight pin, 1 mm in diameter (Harrington et al., 1959). The tape is pressed together except near the tail where the ends are separated by a thin piece of folded paper to facilitate removal after exposure. The portion of tape around the pin is coated with an adhesive. The pin is inserted in a 1.8 cm long and 0.3 cm wide glass tubing sealed at the bottom. This serves as a bearing and allows the flag to move freely with the wind. After exposure, the tape is removed and mounted on a microscope slide for examination.
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