1, princeps conductivity: conductivity is the same diameter length of copper-patrated chaly grounding a rod 10 times, can aptius conductivity of the grounding material. II, mundi speciem: artifices utentes instrumentorum machinarum peritissimi ad corpus aeneum lappa liberam creandum, ac deinde processuum fabricandi processum promovendo utere, superficies perfecta exhibens. III, facile est instituere: institutionem et constructionem simplex est, constructio manualis vel mechanica, institutionis oeconomica magis constat.