4 INDEX. 



Page 

 REPORT OF CAPTAIN G. L. TUPMAN, R.M.A. continued. 



Observation of Internal Contact 43 



Measures of Distance between Limbs of Sun and Venus 45 



Comparison of Clocks 46 



Discussion of the Measures made with Double-image Micrometer 47 



Equations given by those Measures 49 



Values of Screw-revolutions, and Semidiameter of Venus ,54 



Final Equations from all the Observations at Honolulu 55 



Description of the Model made to imitate the Transit of Venus 56 



Comparison of Contact-times with Result of Cusp-measures, on the Model 57 



REPORT OF MR. J. W. NICHOL : 



First Contact of Limbs, and Micrometer-measures of Cusps 59 



Diameter of Venus, Internal Contact, and Measures of Interval between Limbs ... 61 



Comparison of Chronometer ,, . . 62 



REPORT OF LIEUT. E. J. W. NOBLE, R.M.A. : 



Observation of Contacts of Limbs, and Resulting Equation 63 



REPORT OF MR. FLITNER : 



Comparison of Chronometer, and Observation of Contacts . . 



Resulting Equation 65 



MERIDIONAL AND ALTAZIMUTH OBSERVATIONS AT HONOLULU, IN TABULAR ARRANGE- 

 MENT : 



Table I. Level Error of the Transit Instrument at Honolulu 



Table II. Collimation of the Transit Instrument 



Table III. Azimuth Error of the Transit Instrument 74 



Table IV. Meridional Transits 86 



Table V. Errors and Rates of the Transit Clock 108 



Table VI Comparisons of the Altazimuth Clock with the Transit Clock 113 



Table VII. Mean Places of Stars observed with the Altazimuth 119 



Table VIII. Observations, with the Altazimuth, of Collimator for Zenith Point, and of 



Stars for Co-latitude 122 



Table IX. Vertical Transits of the Moon and Stars, and Longitude deduced from each . 138 



Table X. Abstract of Longitude from observed Transits of the Moon over the Meridian 190 



Table XI. Abstract of Longitude from observed Zenith Distances of the Moon . . . 192 



Table XII. Comparisons and Errors of Portable Chronometers 194 



Table XIII. Specimen of Comparison of the Portable Chronometers with the Ship 



Chronometers 197 



Table XIV. Abstract of Errors of Travelling Chronometers on Local Mean Time . . 198 

 Table XV. Rates of Ship Chronometers, and Deduced Differences of Longitude in the 



Sandwich (Hawaiian) Group . 203 



Table XVI. Specimen of the Reflecting Circle Observations of the Sun at Honolulu . 206 



Table XVII. Errors of Ship Chronometers at Honolulu before sailing for San Francisco 207 

 Table XVIII. Errors of Ship Chronometers at Mare Island, San Francisco, after the 



Voyage from Honolulu 209 



Table XIX. Chronometric Difference of Longitude between Honolulu and Mare Island, 



San Francisco ; and Longitude of Honolulu thence deduced .... 210 



Plate I. Plan of a portion of Honolulu 7 



Plate II. Plan of the Station at Apua "..''.". 



Plate III. Arrangement of the Double-image Micrometer . 39 



Plate IV. Diagrams illustrating the Internal Contact at Ingress 43 



Plate V. The Model , .... 4 56 



