Abstract: A mechanism is disclosed that is secured in a frame for holding the indicia forming material and is used to cover a housing that includes a light source which may be controlled through a photoelectric cell. The sheets making up the indicia are formed in such a manner that the characters are all created in a stylized "8" digital format with a centrally located "1" superimposed down the middle of the "8". The "8" characters with the "1" superimposed are diestampted in a separate sheet so that it alone may be changed to change the indicia to be displayed.The circuit is designed to produce a flashing light under normal conditions to attract an observer. When an emergency is created such as detected by a smoke detector, a red light flasher is seen giving an additional warning at the front of a house.

Abstract: A power plant arrangement having a gas turbine, a heat recovery steam generator, a steam turbine and means for controlling steam flow from the heat recovery steam generator to the steam turbine so that steam conditions are maintained generally constant and variations in power plant loading are carried by the steam turbine while operating the gas turbine at a generally constant fuel flow.