Erotic photography is almost as old as photography itself. Stereoscopic images of nude females were made by photographers like Auguste Belloc and Félix-Jacques Moulin in the 1850s. Erotic images became widely available in the beginning of the 20th century.
Jules Richard was a French industrialist who had a great influence on the popularity of stereo photography at the beginning of the 20th century. He introduced two new image formats and launched a wide range of stereo cameras, stereoscopes and accessories in various price ranges.
The Glyphoscope was a stereo camera using glass plates, developed by the famous manufacturer Jules Richard from Paris. It was a compact, simple and affordable camera that could also serve as a stereoscope.
I've added 23 glass stereoviews to my collection of images from the First World War. This time no trenches, soldiers or destruction. These images show the monuments of Paris, covered by sandbags to protect them against enemy fire.