主刻度代表的时间单位必须比次刻度的大。
The major scale units must be a larger time unit than the minor scale units.
应使量杯的主刻度线在量杯线路上至少延伸四分之三并对其编号。
The main graduation lines shall extend at least three quarters of the way around the graduate and shall be numbered.
转动主罗经刻度盘到分罗经同一示度，然后装上同步机。
Turn graduated disc of main gyro compass to comply with the graduated disc of Repeaters. Then install synchro.
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