Film and Glass Slides There are basically two types of slides,
those on glass and the film slides we have today. While copies
can be made of both types of slides, the image quality will not
be the same as the original because it is a duplicate. Glass
slides are often confused with glass negatives, but two
important differences exist. Also called lantern slides, glass
slides, are a positive image and a standard size. The positive
image on each lantern slide is sandwiched between two pieces of
glass. These slides include a paper mount and taped-sealed
edges. Glass negatives come in a variety of sizes and are
negative images. Lantern slides remained popular from 1850 until
approximately 1950 and these slides are still used today in many
academic disciplines. The introduction of inexpensive film
slides in the 1950s replaced them. Contemporary slides consist
of the image and a mount. There are three types of mounts
currently available. Guidelines for handling slides and for
storage can be found in my book. Or, fee