\setlength{\unitlength}{0.007500in}%
\begin{picture}(646,164)(9,369)
\thicklines
\put(276,390){\circle{42}}
\put(265,490){\circle{2}}
\put(425,460){\framebox(80,55){}}
\put(515,470){\vector( 1, 0){ 70}}
\put(515,505){\vector( 1, 0){ 70}}
\put(325,505){\vector( 1, 0){ 90}}
\put(325,470){\vector( 1, 0){ 90}}
\put(235,460){\framebox(80,55){}}
\put(275,420){\vector( 0, 1){ 30}}
\put(165,470){\vector( 1, 0){ 60}}
\put(165,505){\vector( 1, 0){ 60}}
\put( 18,494){\line(-3,-5){  9}}
\put(  9,479){\line( 1, 0){ 18}}
\put( 27,479){\line(-3, 5){  9}}
\put(135,525){\line(-1, 0){ 10}}
\put(125,525){\line( 0,-1){ 35}}
\multiput(125,490)(-0.41667,-0.41667){13}{\makebox(0.4444,0.6667){.}}
\multiput(120,485)(0.41667,-0.41667){13}{\makebox(0.4444,0.6667){.}}
\put(125,480){\line( 0,-1){ 30}}
\put(125,450){\line( 0,-1){  5}}
\put(125,445){\line( 1, 0){ 10}}
\put(615,525){\line( 1, 0){ 10}}
\put(625,525){\line( 0,-1){ 35}}
\multiput(625,490)(0.41667,-0.41667){13}{\makebox(0.4444,0.6667){.}}
\multiput(630,485)(-0.41667,-0.41667){13}{\makebox(0.4444,0.6667){.}}
\put(625,480){\line( 0,-1){ 30}}
\put(625,450){\line( 0,-1){  5}}
\put(625,445){\line(-1, 0){ 10}}
\put(645,494){\line(-3,-5){  9}}
\put(636,479){\line( 1, 0){ 18}}
\put(654,479){\line(-3, 5){  9}}
\put(445,485){\makebox(0,0)[lb]{\smash{g(B)}}}
\put(365,520){\makebox(0,0)[lb]{\smash{B}}}
\put(365,445){\makebox(0,0)[lb]{\smash{B'}}}
\put(270,385){\makebox(0,0)[lb]{\smash{K}}}
\put(140,510){\makebox(0,0)[lb]{\smash{X}}}
\put(140,450){\makebox(0,0)[lb]{\smash{X'}}}
\put(595,448){\makebox(0,0)[lb]{\smash{Y'}}}
\put(595,510){\makebox(0,0)[lb]{\smash{Y}}}
\put( 5,478){\makebox(0,0)[lb]{\smash{$\delta$X = X - X'}}}
\put(660,480){\makebox(0,0)[lb]{\smash{$\delta$Y = Y - Y'}}}
\put(250,485){\makebox(0,0)[lb]{\smash{f(  ,K)}}}
\end{picture}


