To fit correctly measure the width of the window plus 30/40cm (12-16), this will ensure your curtains will comfortably cover your window. Fit your track or pole approximately 15cm (6) above your window recess and centre ensuring you have 15-20cm (6-8) either side of the window.
A keg is a fancy version of your basic barrel. In the factory, a sheet of stainless steel is rolled into a cylinder and welded together. Then, at the cylinder's midpoint, a set of ribs is pressed into it for added rigidity. Next, top and bottom steel plates are stamped out and likewise welded into place.
The parts of a keg. Pictured is an example of a popular keg, called the Sankey beer keg. The parts of this particular keg include the tap pump and the tap head. The tap pump is what increases the pressure inside the keg to force the beer out. The tap head (or spigot) is where the beer is dispensed.