somebody says that the experimental setup for measuring the speed of the light in Fizo's experiment is the largest machine is that right?
Balderdash. The largest machine is the global communications system, or international telephony to you.
The largest operating man made machine in the world is the CERN LHC. The Bagger 288 comes in second. Here are the details of both machines for you. The Bagger 288 is the largest digging machine in the world. The bucket-wheeler excavator named Bagger 288 (Excavator 288) is built by the German company Krupp. More specifically, it is a mobile strip mining machine. It is the largest tracked vehicle in the world at 13,500 tons. However, Bagger is powered from an external source and is more correctly described as a mining machine which can be moved, while the crawler-transporter was built as a self-powered, load-carrying vehicle. The Large Hadron Collider (LHC) is the world's largest and highest-energy particle accelerator. It is now the worlds largest operating machine. It is expected that it will address the most fundamental questions of physics, advancing humanity's understanding of the deepest laws of nature. The LHC lies in a tunnel 27 kilometres (17 mi) in circumference, as much as 175 metres (574 ft) beneath the Franco-Swiss border near Geneva, Switzerland. I must make a comment concerning 'Flossie's' answer as balderdash. If he/she had done a little research, telephony or communication networks are a series of massive devices of which includes, computers, servers, satellites and transmission microwave towers, transmission wires, and not just 'one' machine. Just a point of correction. Hope this helps you. Regards, Warren