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  1. Communication No. 41 from the Research Laboratory of the Eastman Kodak Company.
  2. 1903–04, page 60; 1904–05, page 92.

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Communication No. 41 from the Research Laboratory of the Eastman Kodak Company.

1903–04, page 60; 1904–05, page 92.

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Δ u = - n 2 - 1 2 n 3 ( h u ) 2 d
Δ u = - 0.0021 mm .
diameter = 0.000056 mm .
Δ u = - n 2 - 1 2 n 3 d 3 tan 2 α = 9 tan α
Δ u = - 0.66 mm .
d = 0.016 mm ,
d d = d n n 2 d
that             d p = 0.35 d d
d y = 0.35 y d d u
In our instrument             y = 189 mm u = 708 mm d y = 0.35 d d × 189 708 = 0.093 d d In an actual measured case d d was 0.76 mm and d y was found to be 0.061 mm so that d y = 0.080 d d , thus agreeing well with the calculated result found above .
f is the true focal length of the filter alone .
F = - d f f 1 2
and F = d f ( 1500 ) 2 In the magnification instrument i = 30 mm and d y y = F . i = 30 d f ( 1500 ) 2 For an actual pair of filters d f = 37 mm y = 189 mm d y = 189 × 37 × 30 ( 1500 ) 2 = 0.094 mm d y found by measurement was 0.112 mm .