Sonic Nozzles are also known as âCritical Flow Venturisâ or âCritical Flow Nozzlesâ. What is a Sonic Nozzle? A âsonic nozzleâ (also known as âCritical Flow Venturiâ or âCritical Flow Nozzleâ) is a flow meter that can be used as a calibration standard for gas flow meters or any flow measurement device. By design, sonic nozzles are a constant volumetric flow meter.
The Abacus: A Brief History. Abacus is a Latin word that has its origins in the Greek words abax or abakon (meaning table or tablet) which in turn, possibly originated from the Semitic word abq, meaning sand. The abacus is one of many types of counting devices which are used to count large numbers.
An abacus is a counting board or an ancient version of a calculator. Its first recorded use is by the ancient Sumerians in about 2500 BC. From that time on it seemed that all â¦ the ancient cultures used an abacus in some form or another.It is still used in parts of Asia and Africa today.bacus is not like the modern electronic calculators that perform all of the functions of their own and then present the result in an electronic form on their screens. It is rather a tool that helps in counting the numbers with the help of reference in its beads.