The diapositives are centered on the picture carriers and the
reduced focal length is set to 0.G1 mm on the focal length
micrometers. Each plotting camera has the movements CJ and y>
The observing microscopes are moved, close and parallel to the
picture planes on cross-rails, by the space rods. The 7.5x eye
pieces have a field of view of 22 mm, representing 44 mm in
the contact print, a feature which has a favourable influence
on the compilation speed. Coated optics, Dove prisms, adjustable
eyebase and squint correction by optical wedges are standard
equipment.
The space rad intersection is supported by the z column in the
tracing stand. The platting pencil is forward of the z column;
the tracing stand therefore has a parallel guide. Control of
elevation movements is by a drum in the base of the tracing
stand convenient to the finger tips of the right hand. The
pencil point is illuminated, can be lifted and has a magnifying
glass for easy supervision at the further end of the plotting.
Fig.4. :
Side table and linear pantograph fitted to the
B9 for platting at larger scales.