Surface combustion burners or radiant tile burners in comparison produce nitrogen oxides' levels 60-70% less. Therefore John Joyce's research into low NO x burners revolved primarily around surface combustion techniques. Another issue was the effect combustion temperatures have on the formation of NO x.
soup sandwich. A slang term used by members of the United States Army to describe a fellow soldier whose performance is unsatisfactory. This term is often shortened to just soup.. The term expresses a state of extreme uselessness, which can be understood by considering the functionality and worth of soup between two slices of bread.
I think what Americans call a grilled cheese sandwich is called a fried cheese sandwich in England. If it is made in a frying pan (Americans call them skillets) . In Britain our version is a toasted cheese sandwich also known as a cheese toastie. They are very popular and made in a sandwich toaster.