Jar (unit)
The Jar , derived from the English term for the Leyden jar "Leyden jar" was a unit of electrical capacity , which in the Royal Navy was used.
1 Jar = 1.111 · 10 −9 Farads = 1.111 nF
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- metalpass.com
- Admiralty Handbook of Wireless Telegraphy: HM Signal School, British Admiralty, London 1931, p. 119.