Heating and ventilating buildings : a manual for heating engineers and architects . ousand. This system of rinding COs was devisedby Otto Pettersson and A. Palmqvist, two European instrument used for this determination is shown in Fig. 8, and can be had from any dealerin physical apparatus. It con-sists of a measuring-vessel, A,connected with a U-shaped bu-rette B, from which communica-tion can be made by a smallstop-cock, b; a manometer,^,containing a graduated scalenearly horizontal; and two stop-cocks, f and g, by means ofwhich communication can bemade with the air. One sideof
Heating and ventilating buildings : a manual for heating engineers and architects . ousand. This system of rinding COs was devisedby Otto Pettersson and A. Palmqvist, two European instrument used for this determination is shown in Fig. 8, and can be had from any dealerin physical apparatus. It con-sists of a measuring-vessel, A,connected with a U-shaped bu-rette B, from which communica-tion can be made by a smallstop-cock, b; a manometer,^,containing a graduated scalenearly horizontal; and two stop-cocks, f and g, by means ofwhich communication can bemade with the air. One sideof this manometer,/, is in com-munication with the closed ves-sel C\ the other side can beput in communication with themeasuring-vessel A. The buretteB contains a saturated solutionof caustic potash (KOH). Theflask E contains mercury, andby raising it, when the stop-cock c is open, the mercury will risein the flask A, and the air will be driven out. If the flask E belowered the mercury will flow from the measuring-tube, andthe amount of air entering A can be measured by the gradua-. Fig. 8 — Apparatusfor Determining COo in Air. PRINCIPLES OF VENTILATION. 29 tions. When the measuring-tube A is full of air, the stop-cocksc, b,f, and g being open, the position of the drop of liquid inthe horizontal tube of the manometer is accurately read. Thestop-cocks c, a,/, and^are then closed, that at /> opened, and thevessel E raised, driving the air out of the measuring-tube Ainto the absorption burette B. This operation of raising andlowering the flask E is repeated several times; it is thenlowered, and the air is drawn over into the measuring burette ;the cock a is then opened and the vessel E manipulated untilthe reading of the manometer on the horizontal scale agreeswith that in the beginning of the test. The reading of thegraduated tube A gives directly the amount of C02. Thedeterminations are made with air of ordinary humidity, andthere is a very slight correction due to
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