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chapter:
INTRODUCTION
CHAPTER I: THE ZODIAC AND THE PLANETS
CHAPTER II: THE PHASES OF THE MOON
CHAPTER III: THE COURSE OF THE SUN THROUGH THE TWELVE SIGNS
CHAPTER IV: THE NORTHERN CONSTELLATIONS
CHAPTER V: THE SOUTHERN CONSTELLATIONS
CHAPTER VI: ASTROLOGY AND WEATHER PROGNOSTICS
CHAPTER VII: THE ANALEMMA AND ITS APPLICATIONS
CHAPTER VIII: SUNDIALS AND WATER CLOCKS
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BOOK I
BOOK II
BOOK III
BOOK IV
BOOK V
BOOK VI
BOOK VII
BOOK IX
2. Methods of making water clocks have been investigated by the same writers, and first of all by Ctesibius the Alexandrian, who also discovered the natural pressure of the air and pneumatic principles. It is worth while for students to know how these discoveries came about. Ctesibius, born at Alexandria, was the son of a barber. Preeminent for natural ability and great industry, he is said to have amused himself with ingenious devices. For example, wishing to hang a mirror in his father's shop in such a way that, on being lowered and raised again, its weight should be raised by means of a concealed cord, he employed the following mechanical contrivance.
Vitruvius: The Ten Books on Architecture. Vitruvius. Morris Hicky Morgan. Cambridge: Harvard University Press. London: Humphrey Milford. Oxford University Press. 1914.
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