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When were the electric characteristics (pyroelectric phenomenon) found?

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When were the electric characteristics (pyroelectric phenomenon) found?

It is said that the first electronic characteristic of tourmaline found was the pyroelectric phenomenon. It appeared in academic literature in 1756, which was written by Epinus and published by the Memoirs of the Berlin Academy. Thus it started to become clear the relations between the thermal and pyroelectric phenomena.

[Reference]
(3) Lang,S.B.,1974, Sourcebook of Pyroelectricity, Gordon and Breach Science Publishers,p102


[Please note]
There is sparse information about research history of the pyroelectricity/piezoelectricity effects caused by tourmaline. We refer to and quote from this literature as the events are presented in chronological order.
The history of Pyro-Piezoelectricity in the Eighteenth and the Nineteenth Century (Japanese version only)
·Author: KIYOSHI YODA(JUKI Corp.)
·Journal Title: Papers of Technical Meeting on History of Electrical Engineering, IEE Japan(2000)
·VOL.HEE-00;NO.1-7;PAGE.1-7(2000)
 
Author: Masaharu Nemoto
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Observation of the pyroelectric effect
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