History Of Technology in Education

Padlock (1720)                                         Polhem devises a portable lock that effectively resists tampering.  Introduction                  Primitive padlocks have been come around since medieval times, but their design left them prone to force or picking. In 1720, Swedish inventor CHRISTOPHER POLHEM (1661-1751) conjured up a lock that was much more resistant to the dexterous hands of lockpickers.  Information                                            Polhem was one of the most gifted mechanical engineer of his day. After study mathematics, physics and engineering at Uppsala University, he set up a clock repairer. His ingenuity was soon spotted by important patrons, including King Charles XI of Sweden. Polhem went on to design many intricate devices both small (watch mechanisms) and large (industrial Machinery). Perhaps his most enduring invention, however, was the PADLOCK. His basic design comprises an elliptical cast iron body containing a series of rotating disk. W