巨型 clockdrive
WWII 之前的巨型 gravity clock drivehttp://forum.hkas.org.hk/web/Gravity_clockdrive_Germany.jpg
圖片說明 (翻譯)"The gravity clock drive of Gustav Heyde/Dresden (Gustav Heyde was a well known company in Germany, established before the second worldwar, which was producing telescopes and mounts) was probably used by Max Wolf (Heidelberg) and is very precise."
頁:
[1]