| 摘要 |
FIELD: physics; clocks.SUBSTANCE: invention relates to the clock industry and can be used in making sand clocks. A flask is rigidly attached by its neck to a rotational axis which is mounted on a vertical base, with the initial position of the flask in a horizontal position with sand concentrated in one of its parts, and symmetrical fixed operating positions of the flask when the part with sand is turned both sides by 90° to a vertical top position, wherein the number of fixing devices of the flask is equal to the number of its operating positions n when turned to one of the sides from 0° to 90°, wherein n must not be less than 3 when the flask is turned to one side, but the total number of fixing devices of the flask in the setter N=2n-1.EFFECT: invention is aimed at simplifying operation by enabling the setting of multiple different time intervals using one flask of a sand clock owing to that the time interval setter consists a vertical base, a flask of a sand clock and a fixing device therefor.3 dwg |
