Thanks for highlighting that. It sent me down a rabbit hole.
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Alum is a water soluble substance having a general formula of AB(SO4)2·12H2O. It has a monovalent cation and a trivalent metal ion as essential components in its chemical composition. There are two types of alum as ferric alum and non-ferric alum. The main difference between ferric alum and non-ferric alum is that ferric alum is manufactured from bauxite whereas non-ferric alum is manufactured from aluminum trihydrate.
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pediaa.com/difference-between-ferric-and-non-ferric-alum/
Alum Alloy is an pleonasm.
I was thinking about starting a different thread, but I've got you Aerospace Grade Something Something right here.
A lot of companies would use blue smoke and mirrors for a backdrop, but J P Aerospace uses pegboard.
Airships in space! aerohead should note that the hypersonic airfoil is 'faster backwards'. I can't get past the fact that the plasma actuators are on the leading edge instead of trailing.
But OTOH, Elon Musk wants to go to Mars, John Powell just wants to retrieve the Hubble Space Telescope and put it in a museum.
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There is a two-view on the linked website but it won't copy.
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I loaded the page and applied my brass caliper. 1 9/32 by 13/32 of an inch or 41/13 or 3.15 to 1.