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.
2. Steak sandwich - made on a pita and not the expected French roll. Meat was well done and tough. 3. gyro sandwich - dry and flavorless. Utter crap. 4. Chicken schnitzel super wrap. Smaller than past servings. I asked for addition of cheese, they gave me a slice of cheese wrapped in a foil.