Telescopes from the Ground Up Huygens’s 123-foot-long refractor Huygens’s open-air telescope had two short tubes at each end, to hold the lenses. The tubes were aligned with the help of a cord that ran between them.

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Date: 2008-06-20 16:00:51		Telescopes from the Ground Up Huygens’s 123-foot-long refractor Huygens’s open-air telescope had two short tubes at each end, to hold the lenses. The tubes were aligned with the help of a cord that ran between them. Add to Reading List Source URL: amazing-space.stsci.edu Download Document from Source Website File Size: 319,29 KB Share Document on Facebook