Which was the early projector that used spinning discs?

• A. Zoopraxiscope
• B. Kinetoscope
• C. Black Maria Roof
• D. Black Maria Rotation

Answer: (A)

This question tests your understanding of early devices that produced moving images by spinning discs. The Zoopraxiscope is the device that fits this description. It was developed to project motion by using a rotating glass disk that had drawings or photographs arranged around its edge. As the disk turns, a light source shines through or past the disk, projecting a rapid sequence of images onto a screen so observers see movement. This was an early way to visualize motion before true film projection became standard.

The Kinetoscope, by contrast, is designed for individual viewing through a peephole inside a cabinet, not for projecting onto a screen. The terms Black Maria Roof and Black Maria Rotation refer to Edison’s early studio space, including its ability to optimize light for filming, not to a projecting device that uses spinning discs. So the device that used spinning discs to project motion is the Zoopraxiscope.