GOODRIDGE'S OBSERVATION OF THE TRANSIT. 477 



b 



7. 9.27-00 r At this time a rather broad band of light was complete between the two bodies ; 

 or Dec. 8, > < but still a dark shadow was visible behind. The definition was not good, orf 

 19. 9. 27-0. J L account of the boiling of the limb*. 



7- 9-497,-j 



or Dec. 8, > All appearance of shadow totally disappeared just before this. 

 19. 9. 497 J 



Egress. 



JO. 3o. io'o, -] 



or Dec. 8, > At this time a few lines or slight shadow appeared between the two limbs. 

 22. 3o. io'5. J 



, C At this time the shadow gradually darkened, until the black drop assumed a 



10. 3o. 24*0, -. 



T) 8 U solid appearance of the same density as the planet. Unfortunately a dark 



f j cloud came over, and I lost all further views until just before total disappear- 



22. 3o. 24'o.J I J 



[__ ance. 



11. 2. 9'5, -j 



or Dec. 8, > There was just sufficient light to see it. 



23. 2. 9-6. J 



Having no wedge, I found great difficulty in observing the several phenomena, 



the light being so variable, and being unable to change the shades to suit the 

 different lights makes me a little uncertain whether some of the times I took 

 were only due to change of light or actual phenomena. 



TIMES OF PHENOMENA OBSERVED AT THUMB PEAK. 



I have ascertained that, by due attention to the various changes in 

 chronometers and clocks, with assumption of an error of one hour in Fletcher 

 950 on December 10, the comparisons harmonize perfectly. They stand 

 thus 



Fletcher 950. Transit-Clock. Proportion of Intervals. 



(1 h m s li m s 



1874, December 4. 2. 8.17-0 = 18. 5g. 53'o 



roo2oo2 

 6. 2i.o3. 4'o = 14.30.26-0 



1-002660 



10. l.I2.02'0 = l8.27. l8'O 



1-002662 



11. 6. M. 29-0 = 23. 04. 37*0 



In the following calculations we want only the second and third com- 

 parisons. 



We are now to calculate the Transit-Clock Times (which relate to the 

 Transit-Clock at Observatory Bay), the Sidereal Times for Observatory Bay, 

 and the Sidereal Times for Greenwich, for each of the nine phenomena. The 

 proportion of successive intervals of chronometer to corresponding intervals 

 of Transit-Clock = 1 -000000 : 1-002660. 



