. Biophysical research methods. Biophysics -- Research. Standard cell Potentiometer Ebonite bushing Amber. Metal guard ring Fig. 15. (a) Diagram of Townsend balance method of measuring ionization current. (6) Representative diagram of an ionization chamber. The diagram shows the collecting electrode connected to the con- trol grid of an FP 54 electrometer valve. It is possible to measure the current by noting the rate at which the potential of the grid rises, as judged by the change in anode current. There are several ad- vantages, however, irrespective of the nature of the measuring in- strum
. Biophysical research methods. Biophysics -- Research. Standard cell Potentiometer Ebonite bushing Amber. Metal guard ring Fig. 15. (a) Diagram of Townsend balance method of measuring ionization current. (6) Representative diagram of an ionization chamber. The diagram shows the collecting electrode connected to the con- trol grid of an FP 54 electrometer valve. It is possible to measure the current by noting the rate at which the potential of the grid rises, as judged by the change in anode current. There are several ad- vantages, however, irrespective of the nature of the measuring in- strument, in keeping the collecting electrode near earth potential by some system that balances out the ionization current. The method illustrated in Figure 15a accompHshes this by gradually changing the potential of one plate of the fixed condenser (83). If such a measur- ing system is employed there should exist a negligible difference of potential between the collecting electrode and the earthed cylinder which enters the base of the ionization chamber, thus imposing a minimum electrical strain on the insulator which supports the collect- ing electrode. The critical insulator is preferably made of amlK-r, not only because amber is an excclleiil insulator but V)ocause its insulating. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Uber, Fred Murray, 1905-. New York : Interscience Publishers
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