A Handbook to a Collection of the Minerals of the British Islands... by Frederick William Rudler publ. HMSO (1905) page 211(available digitized by Google)
Electricity by Robert M Ferguson, publ. Chambers (1873) page 169 (available digitized by Google).
Elements of Galvanism in Theory and Practice, Vol. 2 by C.H. Wilkinson, publ. M'Millan (1804) pages 52 - 60 (available digitized by Google).