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133
November 19, 1906.
Exam. of plates for variation of No. 6183 on I33951 +57° 806 4h 18.7m +57° 4.8' 8.5 Md? var? 
4 22.4 +57 [[strikethrough]]13[[/strikethrough]]11 (1900).

[[4 column table]]
|Plate|Date|Ex|Est.|
|I28116|Dec. 21, 1901|10|8.7|
|I7609|Dec. 4, 1892|13|8.9|
|I2855|Jan. 16, 1891|?|7.8|
|I9791|Oct. 25, 1893|12|8.8|
|I21817|Nov. 28, 1898|12|9.5|
|I13614|Oct. 2, 1895|12|9.3|
|I12295|Feb. 6, 1895|?|8.0|
|I33530|Oct. 9✔, 1905|20|8.5|
|I25109|Apr. 10, 1900|14|8.5|
|I7610|Dec. 4, 1892|?|8.5|
|I28298|Jan, 19, 1902|10|8.8|
|I3088|Feb. 18, 1891|?|8.2|
|I431|Jan. 3, ✔1890|12|7.8|
|I5364|Jan. 8, 1892|11|8.0|
|I9831|Oct. 30, 1893|11|8.8|
|I23569|Sept. 17, 1893|11|9.1|
|I16554|Nov. 16, 1896|13|9.2|
|I24566|Feb. 6, 1900|31|9.0|
|I22220|Jan. 25, 1899|18|9.0|
|I19536|Nov. 9, 1897|12|8.6|
|I166[[strikethrough]]5[[/strikethrough]]64|Dec. 3, 1896|10|9.0|
|I21543|Oct. 30, 1898|8|9.2|
|I16205|Oct. 19, 1896|17|8.8|
[[/4 column table]]

An examination of the above (23) plates shows a variation of about 1.7 magn. 7.8 to 9.5. Variability confirmed by L.D. Wells. 
W.P. Fleming. Nov. 19, 1906.