CORBET'S OBSERVATION OF THE TRANSIT. 461 



For the longitude of Supply Bay we have therefore 



i 



1874, November 16, by powder flashes, Supply Buy West of 



Observatory Bay 26*82 



December 17, by chronometers (see page 471) 26-16 



December 21 ( ) 26-22 



Adopted Supply Bay West of Observatory Bay 26-5 



h m a 



Observatory Bay East of Greenwich 4. 3g. 33"5 



Supply Bay East of Greenwich 4. 3g. 7-0 



It will be remarked that this longitude depends essentially on observations 

 of transits made with the transit-instrument at Supply Bay, which was not 

 in the best possible order. 



Gr. L. T. 



OBSERVATIONS OF THE TRANSIT OF VENDS. 



REPORT of LIEUTENANT CYRIL CORBET, R.N., on his OBSERVATION of the TRANSIT 

 of VENUS, 1874, December 8, at SUPPLY BAY, Royal Sound, Kerguelen Island. 



[The telescope used by Lieut. Corbet was a new achromatic, by Messrs. 

 Troughton and Simrns, of 4 inches aperture. It was fitted with a solar 

 reflecting diagonal prism, and was mounted upon a tripod stand with hori- 

 zontal and vertical motions, and slow movements in both directions by 

 means of convenient handles.] 



Time by the 



Sidereal Clock 



Baker. 



11. 49. 43-5. First appearance of Venus on the Sun's disk. I do not think I could have- been 



more than a minute late. The Sun's limb was steady, and the External Contact 

 occurred just where I expected. 



12. i . 25 - o. Venus estimated to be half way on. 



12. 14.14-8. Venus being rather more than three-quarters on, I first snw its following limb 

 outside the Sun, a very faint ring of light distinctly marking it out. 



12. 18. 56-1. I could still distinctly see the following limb of Venus, faintly illuminated and 

 nearly coinciding with the Sun's limb. No bluntness to the cusps as yet 

 (Plate XVII., Fig. i). 



