Application of the Barometer to the determination of differences PART V. ASTRONOMICAL INSTRUMENTS. CHAPTER I. HADLEY SEXTANT. Description of the Sextant. CHAPTER II. THE TRANSIT INSTRUMENT. Description of the Transit Instrument PAGR 127 130 CHAPTER III. THE ALTITUDE AND AZIMUTH INSTRUMENT. Description of the Altitude and Azimuth Instrument Adjustments of this Instrument Method of observing with this Instrument Use of the Instrument |