News for hackers. Stuff that matters.

A comment on Telescope Building with John Dobson (2014) [video]. Parent comment

Re:Telescope Building with John Dobson (2014) [video] by Tomte on Saturday July 08, 2017 @02:12PM (#14726497)
And most important advice: make sure you work the mirror only wet. Grinding a mirror the wrong way is a fast track to severe or even life-threatening lung illnesses.
[ Parent | on HN ]
Re:Telescope Building with John Dobson (2014) [video] by digitalshankar on Saturday July 08, 2017 @02:57PM (#14726695)
More info please, i never knew this.
[ Parent | on HN ]
Re:Telescope Building with John Dobson (2014) [video] by Tomte on Saturday July 08, 2017 @03:17PM (#14726774)
Seems I misremembered the "deadly" part. But still quite serious, says http://www.scopemaking.net/mirror/mirror.htm
[ Parent | on HN ]
Re:Telescope Building with John Dobson (2014) [video] by dang on Wednesday July 12, 2017 @02:04PM (#14754918)
It killed Spinoza, but that was a long time ago.
[ Parent | on HN ]