Hi Dick, From personal observation.... The tiles in the dome on the Lowell Mausoleum (just a few steps away from the 24 inch Clark telescope) are thick blocks of blue glass, which let light through. Gene Lucas (17250) Richard Harshaw wrote: >Brian Skiff-- > >I was looking at the photo montage of the New Horizons meeting at Lowell. >Thanks for posting that album for us to view! > >I had a question for you. There is a glass cover over the top of Lowell's >Mausoleum, with some dark tiles that I presume the glass is protected. Any >idea what those tiles are made of and why they need the glass protection? > > >Dick Harshaw >Phoenix, AZ > >"The only thing that interferes with my learning is my education." -- >Albert Einstein, 1879-1955 > > -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.