A bakelite box made of two parts between them there is a slot for inserting a wheel with slides. On one side of the box there are two eyepieces each with a magnifying lens, on the other side in front of each lens is a window through which light enters and allows you to see the image in magnification. The image wheel contains the same image on both sides so that at the same time in front of each eyepiece there will be the same image. The box was made in Belgium and has an American patent.