Container opening aids

The action of the manostat may be explained with the aid of Fig. II, 23, 6. Mercury is introduced into the container until the disc of the float just makes contact with the oriflce, when the pressure is equalised inside and outside the float. The device is connected to the pump and to the system by way of a large reservoir and a manometer. With the stopcock open, the pressure in the system is reduced by way of a by-pass between the pump and the system until the desired value as read on the manometer is reached, then both the stopcock and by-pass are... 

Sanq>ling With Capillaries. Earlier it was pointed out that with the aid of a constriction pipette a sample can be measured accurately. A similar effect can be obtained by allows ing the serum to enter a capillary open at both ends. The serum will reach the opposite end of the capillary if it is held at an angle and then stoppered, and if the capillary has been carefully calibrated an accurate volume can be measured out. Such capillaries are now available commercially, and have been in use in automated equipment in the authors laboratory for at least 10 years. It is now possible to take the capillary and empty its contents into a container for analysis, or into a stream for the purpose of determining any of the materials which can be determined with the autoanalyzer. Figure 33 shows an instrument which is used for this purpose (58). 

Many elderly have vision and co-ordination problems. This is problematic for reading and opening containers and package leaflets pour solutions, dripping eye-drops etcetera. Several aids are commercially available and sold at pharmacies. 

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