Tunnel kiln

A tunnel kiln is:
 * 1) a form of kiln useful for goods which must be rapidly removed out of danger when the firing is finished because of their liability to lose shape if left too long at the finishing temperature (Bourry & Searle 1919)
 * 2) a continuous kiln through which the ware to be fired is passed on kiln cars passing through heating, maturing and cooling zones (Hamilton 1978)
 * 3) a type of kiln in which the goods are placed in wagons and are burned as they travel through a heated tunnel (Stratton 1993)