ASSEMBLIES FOR SUCTION FILTRATION IRVING ALLAN KAYE and WILLIAM I. BURLANT Brooklyn College,Broolilyn, New York
rig=- 1.
Filtration lluembly
THEfilter bell shown in Figure 1, cut from a standard four-liter filter flask, has been used successfully for the past few years for collecting filtrates in Erlenmeyer flasks ranging in size from 50 to 1000 ml. The ground glass plate, an expensive feature in the apparatus described by Fieser,' has been replaced by a rubber mat. The 4.5-in. hole in the latter serves to secure the entire assembly t o the laboratory bench when suction is applied. When cut from a two-liter suction flask, the ' FIEBER, L. F., "Experiments in Organic Chemistry," D. C. Heath and Co., New Yark, 1941, p. 322.
largest Erlenmeyer flask which can be accommodated is the 500-ml. size. For filtering into standard taper vessels which can withstand strong pressure differentials (as ordinary round-bottomed flasks), the filter adapters illustrated in Figure 2 are more useful. The larger adapter has been used only with very large Biichner funnels.
