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Unformatted text preview: blocked with a glass rod) as both sub-stances absorb water vapour from the air very readily. The two limbs of the U-tube are separated by a ground-glass tap T 1 . This keeps the two absorbents out of contact with each other except when oxygen is flowing and also shuts the oxygen stream off from the combustion tube. It is an advantage to have all the com-ponents of the purification train mounted on a small rigid framework. Thus pure, dry oxygen is delivered at the combus-tion tube. The combustion tube. The oxygen is led through the side-arm G (Fig. 85) into the combustion tube L via the horizontal side-arm H which is fused into the combustion tube about 4 cm. from the end (the joint between G and H is also made with impregnated rubber tubing with the two glass tubes touching inside the rubber). The posi-tion of H thus allows the combustion...
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- Fall '06
- Organic chemistry