This was sold under the names of Instantaneous and Instantograph. It proved very popular and is often found fitted to Instantograph cameras. Early examples, before around 1890, have a segment shaped cut-out. This example has an elaborately shaped cut-out designed to give extra exposure to the foreground. Advertisements claim that speeds up to a 1/100 could be obtained. The shutter was replaced in the late 1890s by the 'See-Saw' model.