What is the device by which the film is regularly advanced and then held in place?

What is the device by which the film is regularly advanced and then held in place?

• A. Gate
• B. Pressure Plate
• C. Intermittent Mechanism
• D. Film Loop

Answer: (C)

The device being described is the mechanism that moves film in steps and then locks it in place for exposure or projection. This intermittent mechanism advances the film by one frame and then holds it steady during the shutter or exposure, ensuring precise frame alignment and preventing blur. The gate simply provides the opening where the image is exposed, the pressure plate keeps the film flat against the gate, and the film loop is extra slack to buffer motion. None of those components performs the timed, stepwise advance and hold needed for each frame like the intermittent mechanism does.

The device being described is the mechanism that moves film in steps and then locks it in place for exposure or projection. This intermittent mechanism advances the film by one frame and then holds it steady during the shutter or exposure, ensuring precise frame alignment and preventing blur. The gate simply provides the opening where the image is exposed, the pressure plate keeps the film flat against the gate, and the film loop is extra slack to buffer motion. None of those components performs the timed, stepwise advance and hold needed for each frame like the intermittent mechanism does.