Phenolic insecticides and fungicides . d iy2 inches apart and piecesof %-inch ordinary white rubber tubing are tacked along the innersides of the slots. (The block supporting the funnel in the cut is not PHENOLIC INSECTICIDES AND FUNGICIDES 375 Fig. 4.—Detail of the construction of saddle for holding the necks ofthe separatory funnels in place in the shaker. a part of the rack, but is merely present to hold the funnel in placewhile being photographed.) In practice the necks of the funnels areheld in place by means of saddles placed at intervals along the edgesof the box, details of which are i
Phenolic insecticides and fungicides . d iy2 inches apart and piecesof %-inch ordinary white rubber tubing are tacked along the innersides of the slots. (The block supporting the funnel in the cut is not PHENOLIC INSECTICIDES AND FUNGICIDES 375 Fig. 4.—Detail of the construction of saddle for holding the necks ofthe separatory funnels in place in the shaker. a part of the rack, but is merely present to hold the funnel in placewhile being photographed.) In practice the necks of the funnels areheld in place by means of saddles placed at intervals along the edgesof the box, details of which are indicated in Figure 4. These saddlesare made by screwing pairs of right-angled hooks into the edgeof the box, each hook being two inches distant from its mate. Theends of the hooks are slipped through holes cut in the side of a pieceof rubber tubing of sufficient length to allow it to sag between thepairs of hooks and rest upon the edge of the box. This device offersa firm rest to the necks of the funnels and holds them with surpris-. 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
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsecticides, bookyea
