An old site in Pakistan’s largest province, full of conquest and historical detail – talks about a discovery of an old amulet that was discovered at the archaeological site of Mehrgrah. This one of a kind discovery reveals many secrets, with its technology of creating different metallic objects being used today, especially by NASA.
According to experts, this wheel-like shaped amulet is one of the first objects ever to be made from a wax casting method that is still being used today. The not so perfectly round object was discovered by Jean Jarrige, a French archaeologist and one of the few people to have discovered archaeological sites in Pakistan. However, this discovery didn’t make it the papers until recently, when it was further examined, using the latest technology.
Using the latest techniques in lighting and photography, scientists observed that the light bounces back from this small 2 centimetre amulet. The findings are consistent with the amulet being made from a single piece and that it consists of no soldering parts – not even the joints in the circle. Furthermore, by observing the light reflecting from the amulet, scientists also discovered that the amulet was made purely from copper that was melted at around a thousand-degree centigrade.
The Technology that NASA still Uses
This lost method – that was used by the people of Mehrgrah to mould the metal into a desired shape – was in a way, unique and very simple. According to the experts, they first made a copy of the object with a substance that could melt easily. Then they formed a mould using clay, which was then baked to create a hard template. Once done, the people of Mehrgrah would pour the hot metal into the enclosed baked clay, which would melt the wax and fill the space, resulting in a one-piece metal object – something quite advanced for a 6000-year-old civilisation.
However, this method is still being used today – to make specific metallic objects such as small pieces of space craft, air craft, and even jewellery.
According to NASA, the same method was used by them to create special parts of the Messenger space probe – which is not orbiting space. Furthermore, this same method is used by NASA to build customised parts for the International Space Station.