1. AN ALARM SYSTEM INCLUDING IN COMBINATION ALARM MEANS ADAPTED TO PRODUCE A SIGNAL, FIRST RELEASABLE MEANS FOR NORMALLY DISABLING SAID ALARM MEANS, MEANS FOR RELEASING SAID FIRST RELEASABLE MEANS AT A PREDETERMINED TIME, SECOND RELEASABLE MEANS FOR NORMALLY DISABLING SAID ALARM MEANS, MEANS CONNECTING BOTH SAID RELEASABLE MEANS TO SAID ALARM MEANS, MEANS COMPRISING A MOVABLE MEMBER RESPONSIVE TO A CERTAIN ATMOSPHERIC CONDITION, COUPLING MEANS COMPRISING INTERENGAEABLE ELEMENT CONNECTED RESPECTIVELY TO SAID MOVABLE MEMBER AND TO SAID SECOND RELEASABLE MEANS, AND MEANS MOUNTING SAID INTERENGAGEABLE ELEMENTS FOR MOVEMENT TOWARD EACH OTHER IN RESPONSE TO MOVEMENT OF SAID MEMBER IN ONE DIRECTION TO RELEASE SAID SECOND RELEASABLE MEANS AT A PARTICULAR VALUE OF SAID CONDITION TO CAUSE SAID ALARM MEANS TO PRODUCE ITS SIGNAL UPON THE CONCURRENCE OF SAID PREDETERMINED TIME AND SAID PARTICULAR VALUE OF SAID ATMOSPHERIC CONDITION AND FOR IDLE MOVEMENT AWAY FROM EACH OTHER IN RESPONSE TO MOVEMENT OF SAID MEMBER IN THE OTHER DIRECTION.