Accepting Linke's formula, the potential at 4000 metres is 43,750 volts higher than at 1500 metres.
As a precaution against Tatar invasions he founded fortified towns on his southern frontiers - Tambov, Kozlov, Penza and Simbirsk; but when the Don Cossacks offered him Azov, which they had captured from the Turks, and a National Assembly, convoked for the purpose of considering the question, were in favour of accepting it as a means of increasing Russian influence on the Black Sea, he decided that the town should be restored to the sultan, much to the disappointment of its captors.
It contented itself with reaffirming the Nicene and Constantinopolitan creeds and the Ephesine formula of 431, and accepting, only after examination, the Christological statement contained in the Epistola Dogmatica of Leo I.
Accepting the position in which the Tudor king would have his great nobles, he became the faithful soldier, diplomatist and official of the new power.
He also pointed out reasons for accepting a division of the land into three continents - Europe, Asia and Africa.