482 



CONTENTS. 



I'AOK 



Voyage, and Names of Observers 483 



Site at Burnham 483 



Connexion with the Telegraph 484 



Arrangements for observations at five additional stations, and general failure 484 



Location of the Instruments at Burnham 485 



The Transit-Clock 485 



The Transit Instrument 485 



Micrometer Screw and Intervals of Wires 486 



Zero of Collimation 486 



Error of Level 486 



Error of Azimuth 487 



Meridian Mark 487 



Transits of Stars and the Moon . . 488 



The Altazimuth Instrument 489 



Vertical Circle and Micrometer Runs 490 



Latitude of Burnham 491 



Observations of Azimuth 491 



Results for the Longitude of Burnham 493 



Observation of the Ingress of Venus by Major Palmer 493 



Micrometer Measures of the Distance of Limbs 496 



Equations deduced from the observation 01 Ingress 497 



OBSERVATIONS IN TABULAR ARRANGEMENT : 



Table I. Collimation of the Transit Instrument ....'.... 500 



Table II. Error of Level of the Transit Instrument 501 



Table III. Azimuthal Error of the Transit Instrument 504 



Tables IV. and V. (Abstract) Transits of Stars and the Moon, and Inferred 



R.A. of the Moon's Limb at Transit 508 



Table VI. Longitude of Burnham, from the Meridional Transits of the Moon 512 



Table VII. Longitude of Burnham, from the observed Azimuths of the Moon 512 



