这面铜板离入口很近，在入口的地方刻有一段莫尔斯电码，旁边还有一块天然磁石摆放在一块刻有罗盘刻度的花岗岩上。
There, copper plates near the entrance bear snippets of Morse code, and a naturally magnetized lodestone sits by a compass rose etched in granite.
罗盘刻度盘单独由装有晶体管的伺服系统驱动，指针由自整角机驱动。
Compass card is individually driven by a transistorized servo system and Pointers driven by synchros.
该罗盘可以提高刻度盘的旋转速度，进而提高精确度。
The compass can increase the rotating speed of a dial so as to improve the precision.
该罗盘可以提高刻度盘的旋转速度，进而提高精确度。
The compass can increase the rotating speed of a dial so as to improve the precision.
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