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An early 3D Viewer.

Meccano 3D viewer BC3 meeting notice

This shows the contraption with which I demonstrated a 3D viewing
technique in a lunchtalk at ICL Bracknell many many years ago. Also
the notice for the meeting, produced before people lazily started
using anonymous machine fonts.

The frame held a Heathkit television which I also made, but which is
alas no longer with us so I can't show how everything went together.

Two potentiometers were fitted to the end. The tilt and the base
rotation was measured by rubber bands round pulleys on the frame and
base axis which can be seen in the photo. The potentiometers and
bands aren't mounted.

The tilt and rotation were measured by the A/D port of s BBC micro
which displayed a picture on the screen of the television. The user
tilts the screen or turns the frame around to view the image from
different angles.

For the talk the picture shown was of an L-shaped bungalow. The
actual talk was about a number of other techniques and this model
provided something for them to come around and look at afterwards. It
was quite amusing seeing how many people tilted the screen down so
they could look upwards through the floor of the bungalow.

The base is a roller bearing with sleeve end pieces as the rollers.
The sides are supported by the large circular plates running on small
pulleys, the axle is simply to provide the measurement of the tilt
angle and hold the frame in position, it isn't load bearing.

Other more straightforward Meccano models can be seen here.