Vacuum taps

IkXj, WL alternative working lines. The second one is, of course, optional. J -Ji cone-and-socket joints, at least B.19, preferably B.24. J and can, of course, be replaced by fused junctions. T, hollow key vacuum taps of... 

Fig. 3.3. Pressure equalisation burette in a device for potentiometric titration. For full details of operation see original publication. A break-seal ampoule containing the titrating solution B which reacts with the contents of break-seal ampoules P in reactor R, C sintered filter, Z) 10 ml burette, E 2 mm capillary, F capillary tip, Pt wires from electrodes leading to potentiometer. T, T, 7 PTFE taps, 7J three-way glass vacuum tap.

Fig. 4.3. The rig for purification of a liquid by sodium vapour. See text for details. The O are glass vacuum taps of large ( > 5 mm) bore.

General techniques for high vacuum systems have been covered in detail in various reviews, in particular conventional high vacuum taps and their lubri-... 

When nitrogen has been passed into the system for a third time, place the polymerization tube into the liquid nitrogen Dewar and evacuate the manifold by closing the nitrogen supply and opening the vacuum tap. 

Vacuum within the insulation was higher than that required for negligible gas conduction. It should have been less than 0.1 rather than about 0.5 /x Hg, as measured at the vacuum tap. 

The foams were tested in a cylindrical calorimeter similar to the one shown in Fig. 2. The unit consists basically of two concentric stainless steel cans separated by a 2)4-in. thickness of the test foam. To minimize the end effects of a calorimeter of this type, the upper end was insulated with a high-vacuum space, while the lower end was insulated with an extra-thick section of the test foam itself. Fill and vent lines, as well as suitable vacuum taps were provided in the... 

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