Place a laboratory thermometer on each hatching tray and check the
temperature every time you turn the eggs (6 to 8 hours). If the temperature
falls below 98° F (36.5° C), increase the size of the flame of the kerosene
lamps. If it rises above 100° F (37.5° C), open the hatch in the top of the
incubator to release some hot air and reduce the flames in the lamps or
remove one or more of the lamps