Serpentine and Cloak Slides (Rich Colored) -- October 3, 2023

New York Clipper, 28-February-1903

Philadelphia's Harbach and Company offered Edison films, "film machines," magic lantern slide projectors, and magic lantern slides. I wonder what "Serpentine and Cloak Slides (rich colored)" look like. Perhaps they depict serpentine dances. 

Harbach's Sun Rival -- November 3, 2022

New York Clipper, 04-April-1903

Philadelphia's Harbach and Company offered new and used Edison Kinetoscopes, all sorts of slide projectors, and magic lantern slides and films. 

Magic Lanterns, Films and Slides Bought and Sold -- February 4, 2022

New York Clipper, 04-April-1903

Harback's in Philadelphia advertised new and used magic lanterns and slides, and new and used Edison projectors and films.

JH Steward's Magic and Dissolving View Lanterns and Slides -- June 29, 2017

Magic Lantern Manual, William Isaac Chadwick, 1878

Before motion pictures, magic lanterns were popular sources of entertainment.  A magic lantern is a projector which can display translucent images.  Projectionists created elaborate shows that often told stories and featured elaborate effects like dissolves and the Phantasmagoria, which used scary images.