TABLE 1 
Anaglyphic Double-Projection Systems Usable on Geological Survey Universal Table Frame 
Trade Name 
Angle 
of 
Coverage 
Projector 
Principal 
Distance 
Nominal 
Projection 
Distance 
Diapositive 
Glass Size 
Ratio Aerial 
Negative 
Scale to 
Diapositive 
Scale 
Balplex 
90° 
55 mm 
525 mm 
110 x 110 mm 
153/55 
Super Balplex 
120° 
32 mm 
360 mm 
110 x 110 mm 
88/32 
760 Kelsh 
VO 
o 
o 
153 mm^ 
760 mm 
9% x 9% in 
153/153 
525 Kelsh 
90° 
153 mm 
525 mm 
9^ x 9% in 
153/153 
Super-Wide Kelsh 
120° 
88 mm 
440 mm 
9% x 9% in 
88/88 
Wild WH-6 Plotter 5 
120° 
44 mm 
352 mm 
130 x: 130 mm 
88/44 
Principal distance of projector can be varied in some models. 
The WH-6 Plotter is manufactured by Wild Heerbrugg, Ltd., Heerbrugg, Switzerland.