Liquid Paper Liquid Paper Liquid Paper is an American brand of the Newell Brands company marketed international that sells correction fluid, correction pens, and correction tape. Mainly used to correct typewriting in the past, correction products now mostly cover handwriting mistakes. In 1956, Bette Nesmith Graham, the mother of The Monkees' Michael Nesmith, invented the first correction fluid in her kitchen. Working as a typist, she used to make many mistakes and always strived for a way to correct them. Starting on a basis of tempera paint she mixed with a common kitchen blender, she called the outcome fluid "Mistake Out" and
End correction inside the tube is loaded by the external fluid due to sound energy radiation. This requires an additional length to be added to the regular length for calculating the natural frequency of the pipe system. It is denoted by formula_1 and sometimes by formula_2 . In organ pipes, an antinode is not formed exactly at the open end. Rather, antinode is formed a little distance formula_1 away from open end outside it. This formula_1 is known as "end correction", which can be calculated as, where formula_6 is the hydraulic radius of the neck and formula_7 is the hydraulic diameter of