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absorption pipettes absorption tube annealed ascarite Bores of key bubbling Bureau of Standards capillary inlet Chem Circular closed position Connecting the burette control of gases distributor dry grinding evacuated flask flow straight free from chipping free from scratches gas analysis apparatus GLASS STOPCOCKS grinding compound ground surface handle high-vacuum hollow key hollow-blown cock illustrate the latent insert tube J. R. Branham jellies key and barrel kind of glass laboratory latent possibilities leak lubricant maker maker's name Martin Shepherd mercury millimeters mirror finish National Bureau oblique-bore outer member outlets petroleum pictured in figure placed between thumb plug pressure raised rings rate of leakage ratus rubber sampler sampling cock sampling inlet satisfactory sealed shown in figure simple control Special stopcocks Standards C430 Figure stopcock for gas stratosphere striations suitable amount tee cock tion tool marks traffic control turned 90 TYPES OF STOPCOCKS vacuum volumetric gas wrapped in tissue