The problem of securing records economically over a relatively long period of time, at moderate or high film speeds, led to the design of a new type of oscillograph. Two such instruments, one applied to the study of the Barkhausen effect and the other to the recording of processes in the internal combustion engine, are described. By using a short distance from the mirror to the film it is possible to secure oscillograph records with standard motion picture film. It is shown that the record suffers no inaccuracy by this change from the conventional type of oscillograph. At the routine film speed of 25 feet per second, as used in the engine oscillograph, the shape of the record is similar to a standard oscillograph record at a speed of 160 feet per second. The fineness of the trace can be extended almost to the limit set by the resolving power of the film itself. The errors due to the increased values of the tangent of the angle of deflection are within one percent. Provision is made for viewing the light track, although the scale is too small to make the instrument especially valuable for viewing purposes. A time scale is established on the records without use of a vibrator element.