Kyrides seal

A 5-1. round-bottomed three-necked flask is equipped with a Kyrides sealed stirrer (Org. Syn. 21, 40, Note 1) and two long condensers, and the apparatus is so arranged that, if necessary, the exit water from the condensers may be quickly used to cool the flask. 

The mercury-sealed stirrer may be replaced by a Kyrides stirrer (Fig. II, 7, 12) formed from a P.V.C. gland and lubricated with a mixture of vaseline and light paraffin. The continuous passage of nitrogen may be dispensed with if a fairly wide tube dipping into a little mercury is connected to the top of the condenser the latter serves to retain the nitrogen atmosphere. 

---