Show to regulate incubator it if it seems impossible to regulate the incubator examine the wafer and see whether or not it still ha has s the ether which causes expansion and con sequent regulation of the thermostat the wafers are filled with other ether willed will evaporate through a very small leak detach tile the suspected acted water and shake close to the ear if the liquid Is in it you you will hear it shake and tile the trouble Is not thre there if 11 thero Is no sound of liquid buy a new wafer and save time hine money and worry |