โ Scribed by P. Cohen Henriquez
No coin nor oath required. For personal study only.
A description is given of an apparatus for measuring dielectric constants Compactness of construction is combined with great ease of manipulation, highest accuracy and use of minute quantities of material.
Attention is called to the fact that the measurement of dielectric constants is waiting for application in a large field of pure as well as applied chemistry.
I wish to express my best thanks to Prof. Z w i k k e r for the generous hospitality in his laboratory, and to the firm of K i p p and S o n s for their very agreeable collaboration. The dielectric constant (D. C.) of a substance is given b y the equation ~ ----C/CL where C = capacity of a condenser filled with the substance and CL = c a p a c i t y of the same condenser in vacuo.
Accurate d e t e r m i n a t i o n s of small differences in D. C. are of great i m p o r t a n c e in m a n y cases, e.g. as a test for the p u r i t y of substances, for d i p o l e m e a s u r e m e n t s etc.
These determinations involve the accurate m e a s u r e m e n t of small differences in c a p a c i t y : A ยข = A C/CL. If CL is known A C has to be measured.
In the preceding p a p e r some convenient w a y s of proceeding were explained for measuring v e r y small c a p a c i t y differences.
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