Colorimetric gas sampler-analyzer

Claim 1

A PORTABLE TESTING DEVICE COMPRISING A CASE, A CARRYING HANDLE ON SAID CASE, APPARATUS MOUNTED WITHIN SAID CASE FOR FACILITATING THE BATCH-WISE ANALYSIS OF THE AMOUNT OF A GASEOUS IMPURITY IN THE AIR, SAID APPARATUS COMPRISING A RESERVOIR CONTAINING A SUPPLY OF AN INDICATOR LIQUID WHICH CHANGES COLOR IN THE PRESENCE OF THE GASEOUS IMPURITY, SAID RESERVOIR BEING MOUNTED IN THE UPPER PORTION OF SAID CASE SO THAT THE LIQUID MAY FLOW THEREFROM BY GRAVITY, A VERTICAL REACTION CHAMBER, A FIRST LIQUID TRANSMISSION LINE EXTENDING PARALLEL TO SAID REACTION CHAMBER, SAID TRANSMISSION LINE HAVING AN ENLARGED UPPER CHAMBER, A SMALL BORE TUBE CONNECTING THE UPPER END OF SAID REACTION CHAMBER TO THE ENLARGED UPPER CHAMBER OF SAID TRANSMISSION LINE, A LOWER LINE INTERCONNECTING THE LOWER END OF SAID TRANSMISSION LINE AND THE LOWER END OF SAID REACTION CHAMBER, A SECOND LIQUID TRANSMISSION LINE EXTENDING FROM SAID RESERVOIR TO SAID LOWER LINE, VALVE MEANS BETWEEN SAID SECOND LIQUID TRANSMISSION LINE AND SAID LOWER LINE, SAID VALVE MEANS BEING OPERABLE TO CONNECT SAID SECOND LIQUID TRANSMISSION LINE TO SAID LOWER LINE AND TO DISCONNECT IT THEREFROM WHEREBY SAID REACTION CHAMBER AND SAID FIRST LIQUID TRANSMISSION LINE MAY BE FILLED WITH FRESH INDICATOR LIQUID AND THEN DISCONNECTED FROM THE RESERVOIR SUPPLY, A CONDUIT OPENING INTO THE LOWER END OF SAID REACTION CHAMBER FOR FEEDING THE AIR TO BE TESTED FOR THE GASEOUS IMPURITY INTO SAID REACTION CHAMBER WHEREIN THE GASEOUS IMPURITY IS REACTED WITH THE INDICATOR LIQUID AS THE AIR PASSES UPWARD THROUGH SAID CHAMBER, SAID INDICATOR LIQUID BEING MOVED UPWARD IN