I watched on TV as they where showing gold bars stored in bank vaults and I noticed that they always stack them with the narrow side down and the wide side up. Like this:
So there has to be a mechanical reason why is that. Any ideas?
I watched on TV as they where showing gold bars stored in bank vaults and I noticed that they always stack them with the narrow side down and the wide side up. Like this:
So there has to be a mechanical reason why is that. Any ideas?
They do not always seem to be that shape. For some cuboids which are not designed to be moved regularly, see this picture from Fort Knox.
But for bullion bars in the world market (about 10.9-13.4 kg of gold) which have the standard sort of trapezium cross-section, the top when casting is the wider area to get them out of the mould, so the wider area is defined as the "top" in the international specification) and the fineness, hallmarks and serial numbers usually stamped on top (as illustrated here). Stacking them top face up makes these easier to read for the bars on top, as well as easier to move. Pure gold bars may dent if dropped because of gold's softness, requiring recasting, so some care is needed.
The primary reason I have usually heard is that this makes it easier to lift them.
Pure gold is quite smooth, and very dense, and would be near impossible to lift from the other side.