. Chemical News and Journal of Industrial Science . or,as in Fig. 2, of a wide-mouthed glass bottle with thebottom cut off. A piece of wide glass tubing could be used. A Paper read before the Faraday Society, May 2, 1911. Two Simple Forms of Gas-pressure Regulators. Chemical News, July 7, igii 3. A float; a flask, test-tube, or beaker may be used,weighted at the bottom to cause it to float upright. Abeaker, as shown in both figures, gave the best results ;the rim of the beaker should be an easy fit inside thecylinder. 4. Gas inlet and outlet tubes. 5. A valve connected to the float. In model A
. Chemical News and Journal of Industrial Science . or,as in Fig. 2, of a wide-mouthed glass bottle with thebottom cut off. A piece of wide glass tubing could be used. A Paper read before the Faraday Society, May 2, 1911. Two Simple Forms of Gas-pressure Regulators. Chemical News, July 7, igii 3. A float; a flask, test-tube, or beaker may be used,weighted at the bottom to cause it to float upright. Abeaker, as shown in both figures, gave the best results ;the rim of the beaker should be an easy fit inside thecylinder. 4. Gas inlet and outlet tubes. 5. A valve connected to the float. In model A this valve consists of a small bulb blown atone end of a glass tube, the other end of which is fixed ina cork in the neck of the beaker float; the valve seatingis a short bit of glass tubing ; if the end of this tubing isfirst made square by rubbing on emery cloth, a very fewminutes grinding of the valve on its seating will then makeit almost air-tight. The arrangement of the valve-seatingin a cork in a slightly wider glass tube, connected at one. ^^ ^^ O ^ Fig. I. end with the gas supply pipe and at the other end passingthrough a cork in the cylindrical vessel, is obvious fromthe drawing. In setting up the apparatus, water is poured into theouter vessel ; when gas is passed through in the directionshown by arrows it meets with no resistance until the pres-sure of gas in the inner vessel causes the water level, andconsequently the beaker, to sink, and so closes, or nearlycloses, the valve. If the initial pressure is high enough,the pressure in the inner vessel, that is, the gas deliverypressure, will be maintained constant at an amount equalto the difference of water level in the two vessels when thevalve is just closing. Pouring water into the outer vesselwill give a higher pressure, taking it out will reduce it. In model B the inlet and outlet tubss have to be blowninto a verti;al tube; the valve is a glass rod fixed in thecork of the float at one end and having a cylindrica
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