The #10 cirkut camera was the most popular cirkut camera made, with around 1500-1800 cameras made from 1906 to the 1940's. It shot film up to 10" film wide length. The camera most commonly came came with a turner reich triple convertible 10"/18"/24" lense and a rising and falling front for controlling the placement of the horizon line. The early cameras had external fans to control exposure speeds. My camera was made around 1914, and was one of the last years with this design.

The camera with a 24" artar, which works great in the midwest for group shots

The speed fans control exposure, withthe larger ones slowing camera rotation, and increasing exposure.

The fan screws into the camera with the grove in the end engaging the post on the camera
The fans screw into the bottom of the film back. They were marked with an exposure speed, with this one being a 1/10 second exposure.

The small gears were matched to the lenses and marked with the tooth numbers. The fan camera gears were inserted onto the post on the camera.


Images from the camera can bee seen here
http://www.jamieyoungphoto.com/Cirkut%20photos%20people%201.html
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