Manufactured from 1912 to 1926 by the Eastman Kodak Co. This is a truly small “pocketable” camera of about 2 1/2″ x 4 1/2″. It used trellis struts to extend the lens from the body. This one features a Rapid Rectilinear f/7.7 fixed-focus lens and a Kodak Ball Bearing shutter.
Little is know about how Ansel used this camera, only that it was likely taken with him on his second visit to Yosemite in the summer of 1915.
These vest pocket cameras were popular with soldiers serving in WWI. Mountain climber George Mallory was carrying one of these cameras when he was lost on Mt Everest in 1924.
The image below is of Ansel’s camera which is on display at the George Eastman House museum.