The glass electrode used to measure pH was placed in a grid circuit in the vacuum tube, producing an amplified signal which could then be read by an electronic meter.
22.
Therefore, the glass electrode can be used only with a high input-impedance measuring device like a pH meter, or, more generically, a high input-impedance voltmeter which is called an electrometer.
23.
Chemist Glen Joseph at Sunkist was attempting to measure the hydrogen-ion concentration in lemon juice electrochemically, but sulfur dioxide damaged hydrogen electrodes, and non-reactive glass electrodes produced weak signals and were fragile.
24.
The indicator electrode must be suitable for the particular type of titration ( i . e . a glass electrode for acid-base reactions and a platinum electrode for redox titrations ), and should reach equilibrium rapidly.
25.
An antique violet ray set with glass electrodes and control box is featured in Bohumil Hrabal's 1974 novel " PostYi ~ iny " ( Cutting It Short ), as well as JiY?Menzel's 1980 film adaptation of the same.
26.
The needles themselves, as thin as a thread, were forged on a microscopic anvil by Pedersen and his colleagues and adapted from a type of invisibly pointed glass electrode developed 20 years ago at UCSF to probe single cells of the human nervous system.
