assume that the chamber is viewed through 6 x binoculars at a distance of 50 meters, 
Unfortunately, there exists no way of plotting the perceptual frame on a flat surface 
without distorting some distances. However, we may plot on a Euclidean polar co- 
ordinate frame and perserve sensory radial distances. Other sensory distances will 
be distorted on the map but can be computed from (14). The procedure is the same 
as that in constructing a map of the earth in which air distances and direction from a 
certain airport are plotted correctly, but other distances and directions are distorted, 
Using this kind of map we plot in Fig. 10 the sensory polar coordinates of the stimulus 
in Fig. 9 when viewed as described through binoculars for which ß = 2b. This is 
compared with the result obtained by applying the correction (9), and with the result 
obtained by direct view from the distance d of (8). In Fig. 11 we make the same 
comparisons using correction and distance according to (9a). The function f 
employed is an interpolation of the empirical data for the observer G. R. of [5].