Bruno Kolbe, Francis ed Legge, Joseph Skellon, tr., "An Introduction to Electricity". Kegan Paul, Trench, Trübner, 1908. 429 pages. Page 391. (cf., "[...] high poles covered with copper plates and with gilded tops were erected 'to break stones coming from on high'. J. Dümichen, Baugeschichte des Dendera-Tempels, Strassburg, 1877")
