Phenolic insecticides and fungicides . Fig. 5.—Rack holding six large separatory funnels during an intervalbetween the three extractions with benzene. 376 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION ing tenacity, from being thrown out by the motion of the shaker. Thehorizontal slots (Figure 3) care for the other ends of the funnels withequal efficiency. The slot arrangement for holding the stems allowsfor a considerable variation in the length and size of the stems as isusually found in purchasing different lots. Water Bath and CondenserFigure 6 represents the water bath and condenser used in
Phenolic insecticides and fungicides . Fig. 5.—Rack holding six large separatory funnels during an intervalbetween the three extractions with benzene. 376 UNIVERSITY OF CALIFORNIA EXPERIMENT STATION ing tenacity, from being thrown out by the motion of the shaker. Thehorizontal slots (Figure 3) care for the other ends of the funnels withequal efficiency. The slot arrangement for holding the stems allowsfor a considerable variation in the length and size of the stems as isusually found in purchasing different lots. Water Bath and CondenserFigure 6 represents the water bath and condenser used in distillingoff the excess benzene used in the extraction of the phenols. Special i i. 6.—Distilling off the excess of benzene accumulated in thethree extractions. mention is made of this illustration to call attention to the location ofthe condenser on the edge of the table, the location of the receivingflasks below the table, and the manner of holding the flasks in the waterbath. Danger of fire through breakage of the receiving flasks, or un-condensed vapor being carried to the flame, is greatly lessened byplacing the receiving flasks below the table. PHENOLIC INSECTICIDES AND FUNGICIDES 377 Device for Holding Flasks in Place in a Water BathFigure 7 pictures a 500 cc. Erlenmeyer flask with its dress on,ready to be placed in a water bath. The flask is dressed for the oc-casion by slipping over its neck three rings of the water bath; follow-ing the smaller ring there comes a hollow truncated cone, whose lowerdiameter is of a size to fit the groove of the smaller ring, the upperdiameter being just large enough to pass over the lip of the flask. The
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsecticides, bookyea
