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                                                                        ! # $        δθ   %       &  δθ     ! #                      '              !          % (  δθ                      )*%   %       +                                           *              , -     !              .*                  % !  δθ !   2δθ         %                 *          *     *    %        %                      !  # /            ! 0        *       1        *  1'% '2       .  % 1% '% 2   &        3#  +                                            4          *  4       1  .                  *    ,*           +           $   % +  *  .       5      1 +      0   ,*        1'#  +  '         3   5       *   * %   +  *               /     6   7        1 (   #         *           1     6  7     *  *  *   11 second *3600 180 radians π   =   1* *50,0003600 180 m π   µ  = 0.25  m  µ  ≅     8                 #    1'5'29 ! 0  PositionAutocollimator Mean ReadingDifference from first readingRise or fall over 50mm baselengthCumulative Rise or FallAdjustment requiredError mm seconds seconds  µ m  µ m  µ m  µ m0 0 0 0 00-50 20 0 0 0 1 150-100 18 -2 -0.5 -0.5 2 1.5100-150 16 -4 -1 -1.5 3 1.5150-200 10 -10 -2.5 -4 4 0200-250 14 -6 -1.5 -5.5 5 -0.5250-300 24 4 1 -4.5 6 1.5300-350 22 2 0.5 -4 7 3350-400 18 -2 -0.5 -4.5 8 3.5400-450 10 -10 -2.5 -7 9 2450-500 8 -12 -3 -10 10 0     *    % *            8   1 :  *  %      ! 3 -12-10-8-6-4-200100200300400500600 ! 3 . & Straightness ErrorCarriage Position (mm)    C  u  m  u   l  a   t   i  v  e   R   i  s  e   o  r   F  a   l   l   (  m   ) 0   $          ; %             8 %  .&      *   *        .               & .      .      8 3      . &      *             <  ( 3;;3#(0    / ! 3   -1012340100200300400500600 !  Straightness ErrorCarriage Position (mm)    E  r  r  o  r   (  m   )
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