What was this optical apparatus called?
This apparatus entered Iran about 120 years ago (in 1900) after the king of that time had a visit from an exhibition in France.
It was used for showing pictures (non-motion ones) and had some round outlets through which the observer could watch the pictures. Its intended use was entertaining, especially the kids.
When the kids heard the call of the apparatus-man, they ran happily towards him, circled around him and stood in line eagerly to watch the pictures after paying some small amount of money.
The pictures could be photos from European cities, famous actors and actresses, different animals, etc. While the observer was watching through the outlet, the apparatus-man explained each picture in an exciting manner and mesmerized the observer by his stories, so they wished they could visit those places some day in the future.
Later, other personal devices were invented like the "View-Master" which were somehow a modern version of that apparatus.
The device had two handles on its top and the showman could go to another pictures by turning/ twisting those handles. The pictures were different yet had the same theme (for example; there were all photos from different beautiful landscapes in Paris). The showman explained each picture and then went to another one.
This is a drawing of the inside part of that device according to definitions I found in Persian websites. Sorry for my bad drawing.