Place two or three lit kerosene lamps in the incubator and allow the
temperature in the incubator to rise to 98° F to 100° F (36.5° C to 37.5° C).
This should take 2 to 3 hours. The lit kerosene lamps must be clean and the
operator should be careful to regulate the flame to avoid producing smoke,
which would poison the embryos in the eggs.