![]() Experimental psychologists then analysed the perception of both designs by showing them to 24 non-chemists and tracking their eye movements. The group showed the new design informally to a number of chemists, including a member of the relevant International Union of Pure and Applied Chemistry committee, and says it received a ‘surprisingly positive reception’. This provides a better visual representation of the aufbau principle – which states that electrons fill up the lowest energy orbitals first. The lighter, more fundamental elements are at the base of the table, and properties such as reactivity, atomic number and atomic mass increase from bottom to top. They argue that displaying the table upside down makes sense in many ways. ‘Looking at a problem from a new viewpoint often gives rise to new ideas, so this orientation of the table will undoubtedly give us all a new perspective,’ the authors write. In an opinion piece for the journal Nature Chemistry, a group led by the University of Nottingham’s Martyn Poliakoff says that the traditional version of the periodic table used to teach students about the chemical elements makes some concepts difficult to understand, and that a flipped arrangement of elements would be more intuitive. Could it catch on in schools and universities?Ī group of UK researchers has suggested introducing an inverted version of the periodic table, with heavy elements at the top and the lightest at the bottom. I was just happy it flattened out when turned right side up and left the tubing as an extra precaution against sagging long term.The inverted periodic table. I could be completely wrong but that is my assumption. ![]() At the bottom of the c channel groove there is only 5/8” of material. I believe that the sagging when it was upside down was due to the center c channel slot. I finished my work on the bottom and flipped the table over and it was perfectly flat from end to end. It did not correct the sagging as the tubing took the shape of the table when I attached it. When I had the table upside down in the shop working on the bottom there was sag end to end which is why I added the tubing going lengthwise. I went with what I see a lot who are making large tables do which is add the channels to keep them flat. I have only done 2 large tables like this and both have the c channels added and both are less than a year old so I can’t comment on longevity. Have you had issues with sagging and warping in the past?I added the C channels as a precaution to keep it flat. It's not particularly flat due to the flatsawn lumber I used, but you'd never know it unless you put a straightedge on it. I have an oak trestle table that's only 7/8 inch thick and over the last 15 years it hasn't sagged at all. At 1-5/8 inch your top should be plenty strong to not sag. I'm curious about all the ironwork, the rods and C-channels. Thanks for looking and if there are any questions let me know. I was pleasantly surprised with the curl in the cherry. All cracks are filled with black tinted epoxy and there are some bowties to help control some cracks. ![]() I also inset levelers on the bottom of each leg just in case there was any wobble from the tiles. What isn’t shown is that there are 2 6” posts that are 3/4” diameter on each bracket that are epoxied into holes in the top of each leg. I had the metal brackets used for each leg custom made and they are very solid but I realized after everything was complete I probably went a bit overboard on the number of screws for each leg. There are 3 c channels to help keep it flat side to side and because the top is only 1 5/8” thick and the c channels are inset about 1” I ran 1” tubing down each side as a precaution for sagging end to end. ![]() The build was fairly straight forward and I used a picture of a table I found online as inspiration. I still have quite a bit left that will be used for chairs. I had them cut into 2” thick lumber in 2016 and dried and then it sat in my basement stacked until the table was made. The cherry was a tree cut down at my brothers and we ended up with 2 10’ logs that were 20” diameter. ![]()
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