This record contains one line focus. It is composed of two parts that can be pieced together: one part is longer and one is shorter. The longer part is cylindrical, with various grooves, ridges, holes and screws in it. The shorter piece is cylindrical also, but only one side is opened. This one also has various grooves in it. The closed end has a thin opened slot with two holes at each end. The longer piece fits into the shorter at a certain position where a small added piece fits into a groove. Together, the focus resembles a camera lens.