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A thermostatically-controlled micro-polarimeter tube

✍ Scribed by Kacser, H. ;Ubbelohde, A. R.


Publisher
Wiley (John Wiley & Sons)
Year
1949
Weight
469 KB
Volume
68
Category
Article
ISSN
0368-4075

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✦ Synopsis


Abstract

A discussion is given of the design of tubes for precision micropolarimetry, which involves the consideration of sources of error negligible in ordinary tubes. A micro‐tube has been developed which is adapted to the conventional polarizer and analyser. Special provision has been made for easy filling and recovery of solution, accurate temperature control, and rapid temperature changes. The design minimizes errors due to optical and manipulative causes. Comparison with other polarimeters described in the literature shows that the precision is equal to that of good macro‐tubes and better than most micro‐tubes. The range of conditions over which Useful data can be obtained is substantially wider than with previously described micro‐tubes.


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## Abstract A sensitive electronic thermostat control unit is described in which a thermistor is used as the sensing element. The output from the thermistor bridge network, after amplification, provides grid potential amplitude control of the current in a gas‐filled triode, the anode circuit of whi