Exhaust whistle

Claim 1

A SIGNAL DEVICE TO BE CONNECTED IN A PRESSURE GAS MANIFOLD COMPRISING: (A) A MAIN HOUSING HAVING AN INLET AND AN OUTLET TO PERMIT CONNECTION INTO THE PRESSURE GAS MANIFOLD SO AS NOT TO IMPEDE THE NORMAL FLOW OF PRESSURE GASES THROUGH THE MANIFOLD, (B) A PARTITION IN SAID MAIN HOUSING DIVIDING THE HOUSING INTO A MAIN FLOW PASSAGE AND A COMMON EXPANSION CHAMBER, (C) SAID PARTITION HAVING AN OPENING FORMED THEREIN TO PERMIT GAS TO FLOW FROM THE MAIN FLOW PASSAGE TO THE COMMON EXPANSION CHAMBER, (D) BAFFLE MEANS IN SAID HOUSING PIVOTALLY DISPOSED WHEREBY ON MOVEMENT IT WILL DIRECT AT LEAST A PORTION OF THE PRESSURE GAS THROUGH THE OPENING IN THE PARTITION TO THE COMMON EXPANSION CHAMBER, (E) SAID OPENING SIZED RELATIVE THE VOLUMETRIC CAPACITY OF SAID COMMON EXPANSION CHAMBER, (F) AND AT LEAST ONE WHISTLE MEANS COMMUNICATING WITH SAID COMMON EXPANSION CHAMBER TO RECEIVE PRESSURE GASES AT ALL TIMES WHEN SAID PRESSURE GASES ARE DIRECTED INTO THE COMMON EXPANSION CHAMBER, (G) AND A SUPPLY CHAMBER FOR EACH WHISTLE MEANS DISPOSED FOR OPERATIVE ASSOCIATION BETWEEN SAID COMMON EXPANSION CHAMBER AND SAID WHISTLE MEANS TO REGULATE THE BACK PRESSURE ON THE PRESSURE GASES RECEIVED FROM THE PRESSURE GAS MANIFOLD.