252 Rutherfurd Photographic Measures. 



Correction for Runs. Additive to Observed Readings. 



Fraction 



Corr. Fr 



action 



Corr. Fr 



action 



Corr Fr 



action 



Corr. 



of Space. 



of 



Space. 



of 



Space. 



of 



Space. 





.OO 



4-. OOOO 



25 



-f-.ooo6 



50 



-f-. 0012 



75 



+ .OOI8 





.OI 



-J-. OOOO 



26 



-J-.0006 



51 



4-. 0013 



76 



4-. 0019 





02 



-f-. OOOO 



27 



-J-.0007 



52 



4-.0013 



77 



4-. 0019 





03 



+.0001 



28 



-j-. 0007 



53 



4-.0013 



78 



4*. 0019 





04 



-j-.OOOI 



29 



-j-. 0007 



54 



4-..0013 



79 



4-. 0019 





05 



-j-.oooi 



30 



-J-.0007 



55 



-f.0014 



80 



4-- 0020 





06 



-J-.0001 



31 



-j-ooo8 



56 



4-. 0014 



81 



4-. 0020 





07 



-j-.OOOI 



32 



4-. 0008 



57 



+.0014 



82 



-J-.0020 





08 



-J-.0002 



33 



4-- 0008 



58 



+.0014 



83 



4-. 0020 





09 



-J-.0002 



34 



-J-.0008 



59 



4-0015 



84 



4- • 002 1 





IO 



-J-.0002 



35 



-J-.0009 



60 



4-.0015 



85 



-J-.0021 





II 



4- 0003 



36 



4-. 0009 



61 



4-0015 



86 



4--0021 





12 



4-. 0003 



37 



-J-.0009 



62 



4-.0015 



87 



-{-•002I 





13 



-J-.0003 



38 



-j— 0009 



63 



4-. 0015 



88 



4-. 0022 





H 



+.0003 



39 



-[-. 0010 



64 



-I-.0016 



89 



4- • 0022 





15 



-J-.0004 



40 



-j-.OOIO 



65 



-J-.0016 



90 



4-- 0022 





16 



-J-.0004 



41 



-j-.OOIO 



66 



-J-.0016 



9i 



-J--0022 





17 



-J-.0004 



42 



4- 0010 



67 



4-. 0016 



92 



-i-0023 





18 



-J-.0004 



43 



4--OOII 



68 



4-.0017 



93 



4- • oo2 3 





19 



4-0005 



44 



4-. 001 1 



69 



4-. 0017 



94 



4-0023 





20 



4-: 0005 



45 



-j-. 001 1 



70 



+.C017 



95 



-f.0023 





21 



-J-.0005 



46 



-j-.oon 



7i 



+.C017 



96 



4- 0024 





22 



4-. 0005 



47 



4-. 0012 



72 



-i-.ooi8 



97 



-J-.0024 





23 



4~. 0006 



48 



-{-.OOI2 



73 



-j-.ooiS 



98 



-J--0024 





24 



-J-.0006 



49 



-J-.OOI2 



74 



+ .0018 



99 



-j-. 0024 



As an example of the application of the run and division error 

 corrections, let us take the measures of Merope on plate 16 East. 

 The observation book gives : 



Scale Reading Scale 



on 24 p. Distance. 



125.0932 37 0074 



125.0801 36.9898 



Direct 

 Reversed 



Scale Reading 



on Merope. 

 . 162.1006 

 . 88.0903 



The corrections then are : 



Correction for Runs. 



Direct. Reversed. 



Arg., .1006, -J-' 0002 . Arg., .0801, 4--°oo2 

 Arg., .0932, +.°°° 2 . Arg., .0903, +.0002 



Mean. 

 36.9986 



Correction for Division Error. 



Direct. Reversed. 



Arg., 162, -f .0265. Arg., 125, +-°"3 

 Arg., 125, 4-.0113. Arg., 88, +.0023 



Difference -f-.oooo 



Mean +.0000 



-J— OOOO 



Difference -f- OI 52 



Mean 4-.012] 



-f-0090 



We have therefore : 



Mean of observed distances 

 Correction for runs 



" " division error 



. 36.9986 

 . 4-o-ooo o 



. -{-O.OI2I 



Corrected distance 



37.0107 



