. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 2 im, U. S. DEPARTMENT OF AGRICULTURE. FUMIGATION CHAMBER. The fumigation chamber (fig. ] and fig. 2, b) is of iron tubing, 36 inches long by 12 inches in diameter. One end of this cyhnder is per- manently closed with a heavy iron cap (fig. 1, a). The other end is fitted with a flange and can be closed with a brass plate (fig. 1, h), which is held in place by clamps. One face of the plate is ground to fit the flange, wdiich is also ground. A ^vide rubber gasket is placed between the two faces when the plate i
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 2 im, U. S. DEPARTMENT OF AGRICULTURE. FUMIGATION CHAMBER. The fumigation chamber (fig. ] and fig. 2, b) is of iron tubing, 36 inches long by 12 inches in diameter. One end of this cyhnder is per- manently closed with a heavy iron cap (fig. 1, a). The other end is fitted with a flange and can be closed with a brass plate (fig. 1, h), which is held in place by clamps. One face of the plate is ground to fit the flange, wdiich is also ground. A ^vide rubber gasket is placed between the two faces when the plate is clamped in position. The chamber is designed to lie with its longest axis in a horizontal position. On the side of the chamber intended to lie uppermost three Of)enings are made, one being in the center and one at each end. The opening CZ ^\\\\\\'!r^J^<\\\\\\K^\\K\\\\\\K\\\J.\\\\\\\\\\\\\\\K\K\K\\\\, d WS\\\\\\\\\^ .\\^K\\.\\\.\.\\\\\\KKK\K\\\\\\\\.\KK^\.KK\<\\\\'^. ML Fig. 1.—Diagram of fumigation chamber: o, Iron cap; 6, brass plate clamped on end of chamber; c. gas cock for attaching suction hose; d, vacuum gattge; f, dropping funnel, by means of which the sulphuric acid is introduced into the chamber; /. beaker to contain cyanid. near the capped end is fitted with a gas cock (fig. 1, c), so that the suction hose of a vacuum pump can be readily attached. A vacuum gauge, registering the decrease in pressure in units equivalent to inches of mercury, is placed in the center opening (fig. 1, cZ), while a tubula- ture is placed in the opening near the flange. The tubulature is closed mth a perforated rubber stopper bearing a dropping funnel (fig. 1, e) so arranged that the bulb and stopcock are outside the chamber, w^hile the tube extends dowm inside the chamber nearly to the bottom. The rubber stopper and dropping fuimel can be readily removed when seeds or other material to be fumigated are placed in the chamber. An air pump, driven by a motor and capable of red
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