The changing mechanism is connected to the shutter by a wire cord so that changing a plate sets the shutter, an unusual feature for 1900. The camera was patented by H. Smyth and sold for £5.5.0.

The illustration (right) shows the shutter in the unset position. When the changing mechanism is operated the cord retracts into the body and pulls the capping plate B and with it the shutter plate A to the set position, when set the catch a1 on plate A is held by the face d2 of lever D. When the changing mechanism is returned the spring B pulls plate B back to the left. When set for instantaneous exposures the plate T is pushed to the right, on pressing the release the lever D is rocked freeing the catch a1, plate A can now move to the left pulled by spring A to make the exposure. When set for time exposures T is pulled to the left, on release plate A moves to the left but catch a1 is held by lever E as the aperture X uncovers the lens, it is held in this position until further pressure on the release moves lever D which knocks lever E and frees a1. The patent shows the control knob for T closer to the shutter release.