. The American journal of roentgenology, radium therapy and nuclear medicine . a nar-row tube to which rubber tubing is attachedto convey the gas from its source. The lowerend dips down into the water contained inthe large glass tube or jar of convenient size.(Fig. 2.) This glass tube or jar is providedwith a rubber stopper perforated at threepoints, through one of which the narrow endof the volumeter passes. Two separate glasstubes pass each into the container to just be-low the lower limit of the stopper (Fig. 2).To one of these the pressure gauge is at-tached and to the other a piece of rub
. The American journal of roentgenology, radium therapy and nuclear medicine . a nar-row tube to which rubber tubing is attachedto convey the gas from its source. The lowerend dips down into the water contained inthe large glass tube or jar of convenient size.(Fig. 2.) This glass tube or jar is providedwith a rubber stopper perforated at threepoints, through one of which the narrow endof the volumeter passes. Two separate glasstubes pass each into the container to just be-low the lower limit of the stopper (Fig. 2).To one of these the pressure gauge is at-tached and to the other a piece of rubber tub- II am indebted to Messrs. Wallace & Tiernan forthe courtesy of the use of their volumeter in my work. ing for the outlet of the gas. To this piece ofrubber tubing the intra-uterine cannula is at-tached. A spring relief valve may be pro-vided which works automatically, or in lieuof this a needle valve is placed in the courseof the outlet tubing. I have found this latterto be effective and easy to handle. The springvalve is regulated to blow off at a pressure of. Figure i. 250 millimeters of mercury. While this canbe dispensed with it is an aid and is wellcombined with the needle valve relief. Figure2 represents the apparatus as assembledfrom the parts as described. For the conven-ience of those who do not care to take thetrouble of doing this I have had the siphonmeter and glass jar with outlet and inlet con-nections blown in one piece and attached to amercurial manometer. (Fig. 3.) 459 460 A ]^Ianometer and Flow Volumeter The operation of the siphon meter is asfollows: View X shows the water level 2 inthe meter at the beginning of the pulsation,and view Y shows the water level 2 just be-fore the siphon C-G breaks at D, whichcompletes one pulsation of the meter. Whenthe downward flowing gas in A reaches the to a rise of 100 millimeters within 15 sec-onds. This can be determined readily bypinching the outlet tubing as the flow is reg-ulated till it causes a rise of press
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