Sorry Mairdie, I thought you were referring to the famous German optics manufacturer Zeiss located in Jena, Germany.
The Zeiss is the astronomical projection machine that looks like a giant ant. It’s a desktop filled with switches to do a vast array of complicated moves with the machine. Checking out on the Zeiss was learning how to control it. It’s the top level of the kind of projectors you see in Planetariums, made by that German optics manufacturer in Germany. Spitz is another common brand you’ll see in cheaper planetariums.
In 1967 (the time-frame Mairdie referenced), Jena was located in East Germany.
Would be surprised to discover that a FReeper was seeking employment behind the Iron Curtain.
Regards,