Your tonsils are gland-like structures in the back of your throat. You have one located in a pocket on each side. Tonsils are made of tissue that contains lymphocytes -- cells in your body that prevent and fight infections.onsil stones, or tonsilloliths, are formed when this trapped debris hardens, or calcifies. This tends to happen most often in people who have chronic inflammation in their tonsils or repeated bouts of tonsillitis.
A self-centering chuck, also known as a scroll chuck, uses dogs (usually called jaws), interconnected via a scroll gear (scroll plate), to hold onto a tool or workpiece.
If you have a current model unit, go to the Rowenta website and see if you can view the PDF of the owners manual for details on using your new iron. Generally, the self-cleaning function is a special mode/setting to enable iron to generate a burst of steam that forces deposits in the system out the sole plate of your iron.