useful charts or calculators for working metals and other materials

[Frank S]

This post has little to nothing to do with tools or materials to make tools, but some may find the information contained in the following PDFs very useful should they decide to seek an alternative way to possibly reduce their long term energy costs.
In this post there are a few studies of using the Earth for passive heating and cooling.
Several years ago I was involved in the study of the possibility of cooling a large building constructed in the desert without the need for continuous consumption of energy. Even a modest thermal conversion of 10 to 15 °c could yield a huge savings in HAVC equipment sizing and cost plus amount of energy savings over the life of the building/s
below are some studies of the viability of doing this. as well as some installations done by others plus reports and engineering data
Earth%20tube%20and%20solar%20chimney%20ISEC2004-65093r.pdf

earth%20tubes.pdf

Earth%20Tubes2003-01-07GirjaSharan.pdf

Solar%20Chimney.pdf