Smoke generator

Claim 1

IN VAPOR OR "SMOKE" GENERATING APPATATUS, THE COMBINATION COMPRISING: A LIQUID HEATING CHAMBER; MEANS ADAPTED TO SUPPLY LIQUID AND HEAT TO SAID HEATING CHAMBER; A THERMOSTAT IN SAID HEATING CHAMBER ADAPTED TO MAINTAIN THE TEMPERATURE OF LIQUID IN THE LATTER BELOW THE BOILINAG TEMPERATURE OF SAID LIQUID; A VAPOR RECEIVING CHAMBER CONTIGUOUS WITH AND ARRANGED ABOVE SAID HEATING CHAMBER; UNRESTRICTED CONDUIT MEANS ADAPTED TO CONVERY VAPOR FROM SAID VAPOR RECEIVING CHAMBER; A FIRST METAL SCREEN POSITIONED AT THE TOP OF SAID HEATING CHAMBER TO PROVIDE A PERFORATED PARTITION BETWEEN THE LATTER AND SAID VAPOAR RECEIVING CHAMBER; TUBES ADAPTED TO DELIVER A COOL GASEOUS MEDIUM INTO SAID VAPOR RECEIVING CHAMBER IN A DIRECTION TO IMPINGE ON SAID FIRST SCREEN FIRST CONDUIT MEANS ADAPTED TO DELIVER A GASEOUS MEDIUM TO SAID APPARATUS; SECOND CONDUIT MEANS COMMUNICATING WITH SAID FIRST CONDUIT MEANS AND STAID TUBES; AND VALVE MEANS ADAPTED TO DIRECT A PORTION OF SAID GASEOUS MEDIUM FLOWING THROUGH SAID SECOND CONDUIT MEANS TO SAID TUBES AND THE REMAINDER AGAINST THE OUTSIDE WALLS OF SAID VAPOAR COLLECTING CHAMBER.