The Letter of Petrus Peregrinus on the Magnet, A.D. 1269Note 4 — PART II CHAPTER I THE CONSTRUCTION OF AN INSTRUMENT FOR MEASURING THE AZIMUTH OF THE SUN THE MOON OR ANY STAR ON THE HORIZONBrother Arnold translationA terrella, or earthkin.◇Copy noteReturn to PART II CHAPTER I THE CONSTRUCTION OF AN INSTRUMENT FOR MEASURING THE AZIMUTH OF THE SUN THE MOON OR ANY STAR ON THE HORIZON