. An electrolytic tank developed for obtaining velocity and pressure distributions about hydrodynamic forms . Figure 5 - Wiring Diagram of the Electric Circuit Used with the Double Probe pressure changes with a single probe, the sensitivity of the circuit must be pushed to its limit where instability arising from polarization becomes troublesome. Polarization appears to be less troublesome with the double-probe circuit, and potential differences can be obtain- ed to three significant figures with an uncertainty of no more than 1 in the third place. The circuit used with the double probe which
. An electrolytic tank developed for obtaining velocity and pressure distributions about hydrodynamic forms . Figure 5 - Wiring Diagram of the Electric Circuit Used with the Double Probe pressure changes with a single probe, the sensitivity of the circuit must be pushed to its limit where instability arising from polarization becomes troublesome. Polarization appears to be less troublesome with the double-probe circuit, and potential differences can be obtain- ed to three significant figures with an uncertainty of no more than 1 in the third place. The circuit used with the double probe which was developed at Dr. Malavard's labora- tory^ is shown in Figure 5. The potential across the double probe is balanced by the poten- tial across r, which is R + T^+r^ [13] where V is the input potential. The resistances r^ and r^ are the resistances on either arm of a slide wire voltage divider of about 100 ohms, and R is of the order of 100,000 ohms. The exact value of R depends upon the voltage gain or loss in the probe circuit and upon the de- sired range of r^. Then
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