http://preferredmode.com/tag/afropunk/ 
http://catherinecrouch.com//1index.php Ancient Egypt, India, Peru, Bolivia, Cambodia, Ethiopia, Iran, Armenia, Tunisia, Greece & Italy. These countries, thousands of miles apart, share the same technology used by Ancient builders.
Academic archeology initially thought they had (as always) a religious/ceremonial use. However, scientists did tests and revealed that the clamps were used to pour metal in order to freeze and hold the megaliths together. There are pieces of poured metal still present in Ethiopia to back up scientists’ claims.
The tests ran in the Pre-Inca/Pre-Columbian areas have given a very specific alloy: copper, arsenic, nickel, silicon & iron. The most intriguing fact being that there is no known natural source of nickel in our contemporary Bolivia where the clamps were found…
Last but not least, if metal was poured into those, it means the builders must have had an advanced technology in the form of portable melting device ready for use, regardless of the megaliths locations. It wouldn’t seem logical, given the level of perfection of the buildings, that they ancient builders would bother melting the alloy “manually” from scratch in front of every pouring location.
We recently learned that similar clamps can be found in the Vosges Mountains of France, and our team will soon go there to cover this topic in details; adding another proof that once upon a time, a highly advanced global civilization was gracing Earth.
I worked in civil engineering as a consultant in materials and foundations of heavy structures like bridges and dams. The so called clamps all over the world in megalithic stone structures or other stone structures are the remains of metal H-beams or S-section I-Beams or wooden I-Beams. We use them today in modern structures on stone or concrete bridges. The Romans used it too
First, usually they are found aligned in rows and are not found in every joint; on Parthenon are found on vertical walls (forget about porrtable foundries – a lot of nonsense – I did some scientific research and mathetiacal modelling in the steel works in Motherwell in Scotland) and for the metal ones they are too small and shallow and are made of soft silver and copper (95.15% copper) to secure two 20 or even 2 ton stone blocks. The reason that most of them are at the joints is for pure mechanical pressure reasons to spread the load and since they had no mortar to increase the mass and frictional surface of the base of the beam It is better to use two blocks and also in case one subsides and moves away relative to the other
We’ve discovered evidence in the last few days that these clamps were absolutely not meant to laterally stabilize the megalithic blocks, but they were actively searched for (via destruction of stone at the joints) by later civilizations. We’ve documented all of this and will illustrate the evidence for it in a forthcoming paper.