Carburizing is a heat treatment process in which iron or steel is heated in the presence of another material (but below the metal's melting point) which liberates carbon as it decomposes. The outer surface or case will have higher carbon content than the original material. When the iron or steel is cooled rapidly by quenching, the higher carbon content on the outer surface becomes hard, while the core remains soft and tough.[
 
Technically, it should be "carburized AIR". The fuel already has carbon in it. Carbon gets added to the air when it passes through the carburetor.
 
I haven't gotten past "doward" yet.

As to the circled word, maybe the author is British and meant to say "carburettored."
 

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