218 



ASTRONOMY. 



TABLE C— Continued. 



ion of probable error of colUmation of middle wire of 4:Q-inc7i transit 



Simms — illumination east. (C. N. Thom^ computer.) 



Troiigliton 



Each result. 



A final result — 



A» 



f 



Each result. 



A final result — 



A" 





each result. 



1 

 1 





each result. 



* 



t. 



1 



s. 



ff. 



X. 



s. 



0.096 



0.067 



0.004 



0.150 



0.013 



0.000 



0.273 



0.110 



0.012 



0.165 



0.002 



1 



0.000 



0,050 



0.113 



0.013 



0.081 



0.082 



0.007 



0.158 



0.005 



0.000 



0.086 



0.077 



0.006 



0.163 



0.000 



0,000 



0.357 



0.194 



0.038 



0.079 



0.084 



0.007 



0.125 



0.038 



0.001 



0.090 



0.073 



0.005 



0.210 



0.047 



0,002 



0.153 



0.010 



0.000 



0.179 



0.016 



0.000 



0.070 



0.093 



0.008 



0.162 



0.001 



0.000 



0.134 



0.029 



0.001 



0.345 



0.182 



0.033 



0.^9 



0.066 



0.004 



0.083 



0.080 



0.006 



0.079 



0.084 



0.007 



0.460 



. 297 



0.088 



0.099 



0.064 



0.003 



1 



L 

 1 

 1 















hA^ AABBBKABBflAA 



,,. — 4, Os.lfi 



Probable error.. 









■ VV ^■■WWwW~~™'~ 



... = + Os.Ol 



TABLE D. 



Determination of the value of one division of the level used with the AQ-incJi transit y (by Troughton 

 (& Simms y) from observations made at the mouth of the Rio Grande^ August 19, 1853. Microme- 

 ter attached to zenith. Telescope No. 4. VaL of one rev. ==: 43^\82. ((7. N. Thom^ computer,) 



Observation. 



1 



9 



3 



4 



6 



North end. 



59 



15 



51 



15 



53 



13 



22 



51 



51 



12 



12 



48 



DiiTerence. South end. 





44 



• • 



* • 



36 



• • 



40 



29 



39 



96 



19 



* * 



63 



25 



60 



21 



60 



49 



19 



19 



A • 



57,5 



57.5 



21.0 



Difference. 



44 



• » 



35 



• ft 



39 



30 



V w 



38.5 



36.5 



Mean. 



« • * 



44.0 



• ft • 



ft • ft ft 



35.5 



• ft ft ft 



39.5 



ft ft ft 



29,5 



*• ft ft 



ft ft ■ 



38.75 



ft ft 



ft * • ft 



36.25 



ft * « ft 



Micrometer 

 reading. 



16 52.0 



15 46.5 



15 59.3 



16 43.0 



16 36.5 



15 38.5 



12 88.5 



13 60.0 



13 60.0 



12 63.0 



12 63.0 



13 50.5 



Difference 



1 05.5 



83.7 



98.0 



71.5 



97.0 



87.5 



Difference in 

 arc. 



// 



46.23 



36.68 



42.94 



31.33 



42.50 



38.34 



Val. of one 

 division. 



// 



1.051 



1.033 



1.087 



1.062 



1.097 



1.053 



Sum 



Mean value of one division 



1".065 



6), 388 



