372 



TRANSIT OF VENUS, 1874. RODRIGUEZ. 



TABLE I. COLLIMATION of the TRANSIT INSTRUMENT at POINT VENUS. 



Day. 



1874. 



Sept. i 

 i 



12 

 it 

 it 



>9 



21 

 21 



22 

 22 

 25 

 25 



Oct. 19 

 4 



Object. 



Collimator 



Reflected Wires . 



Collimator 



ff Octantis 



Collimator 



Collimator 



Collimator 



Collimator 



Collimator 



r Octantis 



c Octantis 



r Octantis 



Collimator 



o Octantis 



Reading of Micrometer for 

 Zero of Collimation. 



Observed. 



r 



20-389 

 20-389 



20-381 

 20-385 

 20-377 

 20* 402 

 20-384 

 20-377 

 20-385 

 20-374 

 20-392 

 20-388 

 20-382 

 20-372 



Adopted. 



r 

 | 20' 389 



2o-38o 

 20-380 

 2o-38o 

 2o-38o 



20-384 

 38o 



J2o- 



20-38o 

 20-38o 



Day. 



1874. 



Oct. 26 



26 

 27 

 27 

 3o 



Nov. 1 6 

 24 

 27 

 28 



Dec. 7 

 7 



Object. 



Lacaille 634 . 

 z Octantis . . . 

 Lacaille 1029 

 Lacaille I2o3 

 Collimator. . . 

 Lacaille 1 592 . 

 Collimator. .. 

 Collimator. . . 

 Lacaille 3274 

 Lacaille 1592 



Collimator 



z Octantis . . . 

 Collimator. . . 

 Collimator . . . 



Reading of Micrometer for 

 Zero of Collimation. 



Observed. 



10-378 

 20-376 

 20-398 

 20-327 

 20-379 



20- 395 

 20-398 

 20-389 

 20' 376 

 20-370 



20-386 

 20 400 

 20-383 

 20- 3g3 



Adopted. 



r 



J2o-38o 



l-2o-38o 



20- 3 80 

 20- 370 

 20- 390 

 20-390 



2O' 390 



20-3S5 



20-383 

 20-388 



TABLE II. EREOR of LEVEL of the TRANSIT INSTRUMENT at POINT VENUS, determined by 



SPIRIT LEVEL. 



[The sign + indicates that the East Pivot was low.] 



Day. 



Sidereal Time of 



Level 

 Determination. 



Error of Level. 



Day. 



Sidereal Time of 



Level 

 Determination. 



Error of Level. 



1874. 

 September i 



2 



i3 



"9 



h m 



20. O 



21. 45 



2. IS 



2. 4 5 



3.26 



o. o 



1 6. 27 



17. 5 



18. 3o 



19. 34 

 19.55 

 i 8. l5 



20. 3o 



22. I 8 

 22.40 



23.3o 



0-9 



2'O 



l8 74 . 



September 



+ 3-5 



+ 2-6 



+ 3-3 



+ 1-6 



+ 6-3 



+ 6-9 



23 



- 4-3 



- 3-o 



- 2-9 



- 2-8 



1-2 



O'2 



- 0-7 



+ 0-1 



October 



h m 



19. 33 



19. 55 



20. 23 

 21.23 

 23.25 



o. 20 



20. 5 



21. 55 

 23.i5 



0. 35 



1. 3o 



2. 3o 



5. 5 7 

 6.28 

 7. o 

 7.40 



i -o 



+ 0-2 

 + 0-2 

 - 0'4 



+ 0-7 



o- 1 



- 0-4 



O'O 



o-o 



- 0-9 



