| 摘要 |
<p>The apparatus has a rod (11), a straight arm (12) which engages one end of the rod (11) at its center (13) to be rotatable around the rod (11). A first V-shaped arm (16a) engages one end of the straight arm (12) at its center (18) to be rotatable around an axis extending parallel to the rod (11). A second V-shaped arm (16b) engages the other end of the straight arm (12) at its center (18) to be rotatable around an axis extending parallel to the rod (11). Bolts (20) for supporting glass plates (1a1,1a2,1b1,1b2) threadedly engage the ends (17) of the V-shaped arms (16a,16b). <IMAGE></p> |
