The camera itself is a standard piece with a removable back assembly. This allowed attachment of a focusing screen, plate holder back or Cirkut back. The tripod incorporates a lazy susan style mounting plate and can rotate through 360 degrees. Just below the rotating camera mount is a fixed ring gear. The Cirkut back includes a clockwork motor. A small brass gear protruding from the back meshes with the ring gear and drives the camera. By choosing from a variety of gear sizes, the photographer could set the camera's speed and degree of horizontal coverage. Looking from above, the camera moves counter clockwise. The film roll, which must remain fixed relative the the subject being photographed, is transported past a shutter slot at the same relative speed, but against the direction of rotation of the camera. Shutter speed was determined by the width of the shutter opening and the speed at which the camera and film were driven. The film was expensive, and one slight mistake would ruin the entire roll. A tribute to their ruggedness and versatility, photographers today are still using 80 year old No 10 Cirkut cameras to produce panoramic prints of clubs and events.