You searched for: “coax
coax, cokes
coax (KOHKS) (verb)
To persuade or to try to persuade by flattery or persistent pleading: The host tried to coax the author to make a speech after dinner.
cokes (KOHKS) (noun)
Distillations of coals which are used as fuel and in making steel: The steel factory burned large quantities of various cokes in order to produce rails for the railroads.

The factories were often trying to coax the cokes to heat the metals more efficiently.