Q THE EVOLUTION OF THE STEREOSIMPLEX
MOD. II.
The conception of the prototype of the Stereosimplex mod. II as
a plotter of the second order, begins in 1948.
In the same year the Stereocartograph mod. IV was presented at
Scheveningen that substituted the already successfully series of the
Stereocartograph model III.
The Stereosimplex mod. II was conceived by ^antoni for map
ping at medium and small scale for professional instruction being
adapted also for terrestrial photogrammetry. It was realized by
Officine Galileo of Florence with criteria which should point it at
the general attention.
In the developing of the ideas the inventor followed the concepts
already validated by preceeding achievements, for example the
Stereocartograph mod. Ill (1928), creating for the new instrument
constructive solutions of particular advantages; between these the
crossed guide rods having semi-anular section.
The principal caracteristics of the Stereosimplex mod. II can be
summarized as follows:
• mechanical projection of the homologous rays
• movable photograms and ¡binocular fixed microscope for
collimation
• correction by mechanical means of the distortion of the taking
lens through aspheric cams of easy construction
• plotting of grandangular photographs (up to 90° in the field)
• use of photograms reduced to the standard dimensions of
10 X 10 cm.
• possibility of introducing directly the components bx, by and
b% of the base
• carriages jv and y of the coordinatograph controlled contempo
raneously by a single pantographic system
• pencil carried by a tracing pantograph capable of magnification
and reductions to 2,5 times.
The instrument permitted the amplification up to 4 times between
the scale of the original photogram and that of the design, consider
ing the reduction of the photograms themselves necessary for the
plotting.
After 10 years the production of the instrument was notably modified
and the new version was given the name of Stereosimplex Il/b.
With the idea of semplifying the construction and better respond
