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Fig. 8 ZEW setting mechanism Fig 9 Planimat with SG—1 storage unit
with the model UMS-3 code converter 5, 6 or 8-channel tape punches or a card punch may be connected
to the instrument without any rewiring. When used together with a type STR-2 tape punch, the results
of the measurement may be recorded on 5, 6 or 8-channel punched paper tape.
D. Profile scanning for connection of Orthoprojector
The Planimat may be either directly coupled to the GZ-1 Orthoprojector or to the SG-1 Storage
Unit for operation via a memory (Fig. 9 as an example). After the usual orientation procedure, the
pedal disk of the Planimat is then disengaged by the lever Az and the z-drive connected to the right
handwheel by means of the gear change-over lever Gz below it.
E.Accessories
Other accessories suitable for use in conjunction with the Planimat are: the PR Profilometer (for
automatic scanning and tracing of profiles and cross sections), the EP Spotting Projector (for setting
the instrument on cross-section points) and the ST-2 Printing Head (for printing point numbers on
the large tracing table, when the instrument is operated by one man).
6. Historical remarks
The Planimat is the seventh instrument developed by the Zeiss Works with a mechanical projection
system. In chronological sequence, these are:
. Stereoautograph
. Small Autograph
. Panagraph
. Stereotope
. Terragraph
. Supragraph
. Planimat.
AJ OUT ES Wp HH
Of these instruments, Nos. 1, 4, 5 and 6 are based on so-called plane mechanical guide rods, Nos. 2,
3 and 7 on “spatial guide rods". Tt is a well-known fact that by comparison with the optical principle,
the mechanical principle permits simpler exchange of focal lengths and gives constant image quality
over the entire field. In the aforementioned instruments, the advantages of compensated magnification
for oblique and convergent photography, which are of importance for instruments based on the
optical principle, are of no consequence due to the limited plotting range.
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