The first rotoscope device, 1917:
Max Fleischer's (creator of Betty Boop, Popeye) rotoscope consisted of a drawing board, fitted with a piece of frosted glass, and a motion picture projector mounted underneath that magnified a single frame of motion picture film onto the glass. When the figure on one frame had been traced onto translucent paper, a crank advanced the film to the next frame. Twenty years later Walt Disney used a rotoscope to aid in the drawing of "Snow White".

Left, Max Fleischer's patent drawing, Oct 9, 1917