Largest Refractor in the world is built (1 окт 1892 г. – 1 май 1897 г.)
Описание:
At this time the current largest refractor was 36" but George Ellery Hale developed the new telescope with the help of Yerkes. The telescope remains the Largest Refractor in the world.Добавлено на ленту времени:
Дата:
1 окт 1892 г.
1 май 1897 г.
~ 4 years and 6 months