Theatre Design & Technology - Feb 1967 - 22

Telemeters: An Aid to Efficient Stage Technology
Rudiger Hoffmann and Hansgunther Becker
Translated by David Harris, Berlin
I.R. CODE: engineering/ equipment/ control
(The following article appeared initially in Buhnentechnische Rundschau
for October 1965, pages 20-24. The article is reproduced with the permission of Editor Walther Unruh.--Editor)

The result of the age of automation is that there is almost
no field of technology which hasn't been deeply affected
by the introduction of automatic control devices. Basically
this was made possible by the field of electronics which
provided industry with the necessary prerequisites for automation: a series of devices capable of transmitting information from one element to another, and connecting these
elements logically. On the other hand, the steadily growing
lack of personnel (in Germany) made it necessary to seek
new production efficiency anduas far as possibleuto seek
methods of automation.
In many technical areas it has not been possible to achieve
complete automation, because of the number of unpredictable
factors arising 'in the production process which could not be
handled technically. The trend then shifted towards an attempt to centralize the compilation of data. This means that
at one point in the production process the decision on the
next stage of production lies in the hands of control personnel who make their decisions in turn on the basis of
data received at the control center, regulated and transmitted by telemeters for example. In such cases one refers
to the production process as being "centralized" or "partially automated."
The degree of automation best suited for a particular process remains a question of economics. The shift from partial
to full automation, generally supposing extensive building
and equipment renovation, often does not begin to be justified by the reduction in personnel and overhead costs. In
such cases centralized production control (partial automation) is the maximum in efficiency that can be obtained,
even though it is a compromise solution.
Similarly, in the field of stage and theatre technology it has
become necessary in the past few years to seek solutions
to problems created by the lack of personnel and modern
staging techniques.'
* (Translator's Note: At this point it is necessary to keep in mind the
fact that there is a tremendous difference between Germany and the
United States with respect to both labor markets and theatre unions.
Since 1957/8 Germany has had virtually no unemployment: today
there a;e 100,000 unemployed and a total of 300.000 unfilled employment opportunities. With regard to the theatre unions it is necessary to
remember that the average German stage hand is by no means as well
organized as his American counterpart. Where there is a definite hourly
basis. which is by no means closely adhered to. there is no exact
division of labour; so that the German stage hand becomes more or less
a jack of all trades being called upon to perform a variety of services.
In general the job of a stage hand is not a particularly appealing one,
because more money can be earned in other fields requiring the same
amount or less labour.)

The complete automation of the theatreuin whatever technical form it could be achievednis hardly a desirable goal in
any case. It would mean the end of a dynamic theatre no
longer capable of fulfilling its most significant function, the
living communication of cultural values. On the other hand,
the partial automation of the technical area of the theatre,
achieved by centralization of the control and regulatory

22

functions, not only provides an advantage in personnel
costs, but the resulting technical perfection made possible
by central control systems gives the director greater possibility of effectively staging the most difficult plays of contemporary authors.
The most significant factor in all telemeter control systems
is that the position of each piece of machinery being regulated or controlled from a central console is recognizable
at all times, and that every change can be immediately observed from this control center. This presupposes, among
other factors, that the position of any piece of equipment
be ascertainable at all times. The synchro principle has
proven to be quite suited to this type of data transmission
and is employed successfully today in many leading theatres. It is organically possible to install terminal switches
into telemeters so that the particular piece of machinery
will be switched off as it reaches a predetermined setting.
Telemeters Based On the Synchro Principle. Synchros
are becoming increasingly popular in stage technology for
remote transmission. In principle the various elements of
the synchro have been known since 1897. This type of
system was used in a few theatres before the Second
World War. It did not come into general use, however, until
recent years. One of the reasons that made this system so
popular is the fact that it is quite sturdy and requires little
or no maintenance.
Without going deeper into the physical principles behind a
synchro, it may be characterized as a small slip ring induction motor with a special coil. The simplest electronic
wave is produced by connecting two (principally equivalent)
synchros with their corresponding coils using a potential
of 11 5V or 220V at 50-60 cycles to the rotor coils. One
synchro will function as a transmitter and the other as a
receiver. (Figure 1.) For each setting of the rotor coil in
the transmitter there is a corresponding setting for the rotor
coil of the receiver. This means that every shift in the position of the transmitter shaft will produce a simultaneous
corresponding shift in the receiver shaft.

I~-m
Fig. 1: Principle of Electronic Wave Transmission (left
transmitter, right receiver)

The transmitter shaft is coupled to the power source of the
particular piece of stage machineryuif necessary this coupling is facilitated by a transmission. The receiver is coupled
to a pointer which reproduces a measured quantity on a
clock-type or linear scale. This unit, composed of a transmitter and a receiver in a suitable housing, is called a telemeter. It is also possible to connect several receivers (indicators) parallel to a single transmitter.

IUSITT I

THEATRE DESIGN AND TECHNOLOGY



Table of Contents for the Digital Edition of Theatre Design & Technology - Feb 1967

Contents
Theatre Design & Technology - Feb 1967 - 1
Theatre Design & Technology - Feb 1967 - 2
Theatre Design & Technology - Feb 1967 - 3
Theatre Design & Technology - Feb 1967 - Contents
Theatre Design & Technology - Feb 1967 - 5
Theatre Design & Technology - Feb 1967 - 6
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Theatre Design & Technology - Feb 1967 - 8
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