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132 THE DESIGN OF PHOTOGRAMMETRIC PLOTTERS, HELAVA
material pertinent to the use of mathematical methods in the design of photogrammetric
plotters. The material that should be included in a complete discussion of various items
within the scope of this paper is enormous and in many cases foreign to photogrammetry.
For these reasons limitations have been imposed on the subject and the emphasis has
been placed on items which appear important to the author. The way of presentation
attempts to familiarize the reader with various problems encountered when planning an
instrument based on mathematical methods.
Since few (if any) instruments of the type discussed in this paper have been in
operation for any length of time, the experimental proof of their worth is still lacking.
However, there is very little doubt that this new approach presents enormous potentiali-
ties and that it will change and enrich the science of photogrammetry in many significant
ways. The photogrammetrist will be able to tackle problems that have been insolvable,
they will be able to obtain higher accuracies, proceed in automation and, in general, ap-
proaches and tools to their difficult problem of mapping the world — or why not — the
universe!
Bibliography.
[1] v. Gruber, Otto, *Ferienkurs in Photogrammetrie", p. 207.
[2] Helava, U. V. New Principle for Photogrammetric Plotters, Photogrammetria,
XIV, 2, 1957-58.
[3] Helava, U. V., Aparato de Restitucion Analytico Utilizando Caleulo Digital,
Revista Cartographica, No. 7, 1958.
[4] Williams, Ross E., Automatic Map Compilation System, Photogrammetric En-
gineering, Vol. XXV, No. 1, 1959.
[5] Helava, U. V., Analytical Plotter Using Incremental Computation, Photogram-
metric Engineering.
[6] Moore, W. J. M., Consideration in the Design of an Electronic Computer of a
Photogrammetric Plotting Instrument, Photogrammetria, XIV, 2, 1957-58.
[7] Moore, W. J. M. and Chen, C. C., A Study of an Analog Computing System for
an Analytical Plotter, Photogrammetria XV, 1, 1958-59.
[8] Aid, D. G, Balding, G. H. and Süsskind, C., Topological Transformations
by Electronic Scanning, I.R.E. Transactions on Instrumentation, No. 2, June 1958.
[9] Ross, Leroy E. and Levine, Samuel W., Universal Electronic Rectifier,
Photogrammetric Engineering, Vol. 24, No. 5, 1958.
[10] Deker, Hermann, Rechengetriebe in neueren photogrammetrischen Stereo-
auswertegerüten, Technische Hochschule Stuttgart, (Thesis) 1959.
ABSTRACT.
The application of mathematical methods and electronics to the design of photogram-
metrice instruments is considered from a general point of view to provide a background
for detailed studies. After a historical note special problems involved in this application,
such as the mathematical formulation, means of computation, data transferring, and
servoing are described. Special attention is paid to design principles and finally two types
of instruments that best utilize the advantages of the new approach are specified.
SOMMAIRE.
L'application des méthodes mathématiques et électronique à la conception des instru-
ments photogrammétriques est ici considérée d'un point de vue général afin de servir de
base aux études de détail. A la suite d'un résumé historique, sont décris les problémes
inhérent à cette application tel que la formulation mathématique, les moyens de calcul, la
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