The Hordesman wrote:
If it was ever used, it would be just as well known today as atlantis. Im pretty sure it was just like Leonardo's inventions, a concept that was never used.
Well, now we know its not weed thats behind that research.
? That's a bit harsh.
Even if such a device was used, there is nothing to say that its use would have become common knowledge. If the device was not readily manufactured, or used on multiple occasions, it is more than reasonable to assume that it may have become forgotten or overlooked.
There are many weapons that see limited field use. That isn't to say they didn't or couldn't exist. A perfect example is the Petraria Arcatinus. This seige weapon is commonplace in medieval drawings, yet there is almost no physical evidence that supports its actual use in the field. The only time I know of a petraria arcatinus being mentioned in field use was in the siege of Acre. Apparently King Louis of France successfully made use of a petraria nicknamed "Malvoisin" during that battle.
The fact that you are unaware of a device, doesn't preclude the possibility that it was used. The Archimedes cannon may well have been used. Something doesn't have to be common knowledge to be true. Afterall, if it wasn't for Plato, you probably wouldn't have heard of Atlantis either.