Tech. A:' 



may be of vari'ius materials used in different Xirays. Unbleached 

 muslin or similar cloth serves the purpose vxell. Small piec-s 

 of cloth can be fastened in the top of the funnel by means of 

 clothespins, by lapping the covers over a ring of suitable 

 diameter, or by cutting and sewing into the shape of a skull- 

 cap with a ring sevm in its border. Cloth is re-usable after 

 thorough washing in hot water as a safeguard against carry-over 

 of nematodes from one sample to the next. 



Aluminum clothesline Xirire is excellent for making supporting 

 rings, as it is easily formed and does not rust. Paper, when 

 properly supported, can also be used to hold the sample in the 

 Baerraann funnel. Toilet tissue, paper toweling, facial tissues, 

 or paper handkerchiefs (some of which are water resistant) can 

 be used. A disc cut from plastic or non-rusting metalic screen- 

 ing serves as a support for the paper, which, of course, is 

 discarded after each use. 



6. Funnel racks are a necessity if a considerable number of Baennann 

 funnels are to be set up in the laboratory. A simple manner of 

 holding the funnels is to insert them into holes of about one and 

 one half inches diameter cut in pieces of wood shelving boards. 



A slot should be cut from the edge of the board to each hole and 

 be wide enough to allow passage of the funnel stems. Tapering 

 the sides of the holes xTill help to hold the funnels more stable. 

 Use of a large sized Dipe reamer is satisfactory for this purpose. 



The boards can be assembled or mounted in various ways as the 

 laboratory space permits. Sxamnles are: assemblies similar to 

 bookshelves, mountings such as racks over a xrark table, or 

 shelves along the wall. The one precaution to observe is that 

 there is no chance for water dripping or leaking from funnels 

 into others located below. 



7. Soil p rocessing sinks should be planned for, if one has the 

 opportunity to do so. Hovjever, any sink can serve the purpose, 

 if a few precautions are observed. The greatest hazard is the 

 accumulation of soil in the plumbing system leading from the sink 

 drain. Special traps are available for installation in place of 

 the usual sink drain traps. These special traps retain the larg- 

 er soil Particles and are easily cleaned out. In some sink 

 installations, the drainage can be piped directly to pits or 

 settling tanks outside the laboratory. 



The sink itself should be large enough to acconmodate two pails, 

 and, if possible, have a swing-type faucet high enough to clear 

 the tops of the pails. A faucet which provides for mixing of 

 hot and cold water makes it possible to avoid use of water which 

 may be too cold. Stone laboratory sinks are rugged and serve 

 well for this soil processing ^^fork. Itegular porcelainod iron oi- 

 steel sinks can be used, if protected from abraaion by rubber 



