Thank you for a very good and useful presentation.
During the 1800s the Welsh Slate Industry https://en.wikipedia.org/wiki/Slate_industry_in_Wales exported whole mountains of slate around the world for roofing. So in answer to Birdogio: most places!
Re: learning proper table saw procedures
Howdy from the 51st state... we poor Brit sops even have leering cheese companies running TV ads showing a "carpenter" cutting a block of cheese on a table saw... not even a push stick... no protection... talk about reinforcing ignorance...
Hi Geoff ~ nice one ! Have just used it ~ the scoring and snapping and peeling is a bit tricky but your tip's done the job. Thanks from UK...
Oh dear! The point is well made elsewhere ~ this is a very (italics) silly article.
For instance, the author complains that, after a while of extracting heat in a ground source heat pump installation, the ground source cools! This would have to involve (because, as he states, he and his confederates have done the measurements) that he is actually using a thermal collection coil that is some thousands of miles deep moreover covering the whole of the planet... The planet continuously generates heat!
Other respondents appear totally ignorant of the Laws of Thermodynamics and how subsequent losses in high tension power transmission effectively limit the maximum efficiency that can be obtained from electricity generation.
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