Azimuth-elevation plotter

Claim 1

AN INFRARED SEARCH DEVICE COMPRISING: (A) A ROTATABLE HOUSING; (B) A DIAGONAL MIRROR POSITIONED IN SAID HOUSING TO REFLECT TARGET ENERGY RECEIVED FROM A SOURCE, SAID TARGET ENERGY BEING REFLECTED AT DIFFERENT ANGLES OF REFLECTION FOR DIFFERENT ELEVATIONAL ANGLES WITHIN A PREDETERMINED ELEVATIONAL SECTOR; (C) INFRARED TARGET RECEIVING MEANS INCLUDING A PLURALITY OF INFRARED DETECTOR CELLS MOUNTED IN SAID HOUSING SUBJACENT SAID DIAGONAL MIRROR IN SUCH A MANNER THAT EACH CELL IS ACTIVATED BY TARGET ENERGY HAVING A PREDETERMINED ANGLE OF REFLECTION, EACH SAID CELL EMITTING AN ELECTRICAL SIGNAL WHEN ACTIVATED BY SAID TARGET ENERGY FOR INDICATING THE ELEVATION OF INFRARED TARGET ENERGY RECEIVED FROM SAID SOURCE WITHIN SAID ELEVATIONAL SECTOR; (D) ELEVATION READ-OUT MEANS CONNECTED TO SAID HOUSING FOR ROTATION THEREWITH THROUGH 360* IN AZIMUTH AND INCLUDING MEANS FOR PROVIDING DISCRETE INDICATIONS OF TARGET ORIENTATION AND AN ELECTRICALLY ACTIVATED MARKING DEVICE CONNECTED IN SAID CIRCUIT TO EACH SAID CELL FOR ACTIVATION BY SAID ELECTRICAL SIGNALS, EACH SAID MARKING DEVICE BEING POSITIONED RADIALLY FROM THE CENTER OF ROTATION OF SAID HOUSING A PREDETERMINED AMOUNT WHICH IS INDICATIVE OF THE ANGLE OF REFLECTION ACTIVATING THE CELL CONNECTED TO ITS ASSOCIATED MARKING DEVICE; (E) ELECTRICAL CIRCUITRY CONNECTING SAID READ-OUT MEANS TO SAID INFRARED TARGET ENERGY RECEIVING MEANS; AND (F) MEANS POSITIONED ADJACENT SAID MARKING DEVICES FOR RECEIVING A MARK WHEN A MARKING DEVICE IS ACTIVATED BY ITS CELL.