| 摘要 |
PURPOSE:To obtain an accurate drying time by providing the initial water factor scales and plural trains of drying time scales to the lower plates which can move slidably to each other and at the same time providing a viewing window, the finish water factor scales and plural drying time windows for matching of scales. CONSTITUTION:The both edges of an upper plate 2 are bent into U-shapes, and a lower plate 1 is put into the U-shapes to make both plates 2 and 1 freely slidable. The scales (d) showing the initial water percentage and drying time scales (a), (b) and (c) to the drying reduction factors (e.g., 1%, 0.8%, 0.6%, etc.) are provided to the plate 1. While the plate 2 includes a viewing window having scales (e) showing the finish water percentage and viewing windows 4-6 corresponding to each drying reduction factor. Then the plate 1 is slided to obtain coincidence between a desired finish water factor (e.g., 14%) and the initial water factor (e.g., 24%). In this case, the indications of 9.5, 11.9 and 15.8hr of windows 4-6 show the desired drying time corresponding to each drying reduction. If the scales containing each type of conditions are previously set, the time required for drying can be obtained easily with high accuracy. |
