PRESERVATION OF SPECIMENS IN PLASTICS 



33 



positive latches which might cause explosive rupture of the oven in 

 the event of accidental ignition of the vapor inside. 



If the alkali extraction method of inhibitor removal is to be employed, 

 a separatory funnel of at least 1 liter capacity is required. 



In case the distillation method of inhibitor removal is preferred, 

 apparatus with all-glass connections is needed. This apparatus should 

 include a three-neck flask of at least 1 liter capacity, a short vertical 

 column packed with glass beads, and distilling head with a 0° to 150° C. 

 thermometer having a standard taper joint, a water-jacketed condenser, 

 and a receiving flask with two or three necks according to whether 

 distillation is to be carried out at atmospheric pressure or under vacuum. 

 A retort heater or heating mantle should preferably be employed, al- 

 though satisfactory results may be obtained by using an electric hot 

 plate with a sand bath for heating the retort flask. 



In addition to the apparatus and equipment already described the 

 following general items of equipment and supplies will also be required. 



Equipment 



[Items followed by an asterisk (*) are not essential for small-scale operations] 



Description Number 



Electric hot plate, with temperature control or three-heat switch 1 or more. 



Laboratory balance, 0.01 gm. sensitivity 1. 



Thermometers, - 10° to 150° C 2. 



Ring stand , medium or large size with assorted rings lor more. 



Glass funnels, 4 to 6 inches in diameter 4 or more. 



Watch glasses, 4 to 6 inches in diameter 4 or more. 



Funnel support, 4-funnel capacity 1 or more. 



Beakers, 500 ml. and 1,000 ml 3 each. 



Beakers, 30 ml., 50 ml., 100 ml., and 250 ml 10 each. 



Graduated cylinders, 100 ml. and 500 ml 2 each. 



Pipette, measuring, 2 ml 2. 



Pipette, transfer, 25 ml. and 50 ml 2 each. 



Erlenmeyer flasks, 500 ml. and 1,000 ml 5 each. 



Duplex utility clamp (or equivalent) 2. 



Water bath, circular form, 8 inches in diameter lor more. 



Vacuum desiccator, with glass stopcocks, 8 or 10 inch size 1 or more. 



Filter pump, aspirator type 1 or more. 



Filtering flask, heavy wall, 500 ml 1 or more. 



Rubber tubing, heavy wall, for vacuum connections. . 5 feet or more. 

 Rubber or Xeoprene gloves for each person handling poisonous 



substances 1 pair . 



Biological dissecting set comprising scissors, scalpels, forceps, and 



dissecting needles _"_ _ 1 or more. 



Miscellaneous laboratory implements, including spatulas, knives, 



shears, rulers, files, glass cutters, brushes, and china-marking 



wax pencils 1 set. 



Assorted laboratory glassware, including rods, tubing, stopcocks, 



flat glass, jars, and vials 1 set. 



Power-driven disk or belt sander 1 • 



Power-driven buffing head with 6-inch cloth buffing wheels, 1 



stitched, 1 open type 1- 



Power saw, 8-inch fine-tooth circular saw, or band saw (jigsaw may 



also be used) * 1- 



Power lathe (metal or wood-turning) 3-inch to 6-inch swing, 8 to 12 



inches between centers * 1. 



Drill press, power grinder, milling machine, and other power tools 



advantageous for larger scale operation * lor more . 



