On the other hand, the time between pictures may be too long for taking the sequence comfortably. In this case an intervalometer can be a decided asset. For example, if you were to photograph the opening sequence of a flower in bloom, the time between pictures may be anywhere from 1 to 10 minutes or more. Now that you have generated a roll of film with a progressive pattern of images, you need to simply assemble them in order and staple them in sequence. An industrial duty stapler will work best to do the stapling through the 36 prints.
Registration is of paramount importance.
The best way to insure accurate registration is to use the edges of the picture area or some other mark which remains in the same relative position from image to image, as the registration reference mark. For example one registration reference mark could be the edge of the film, if you are making contact prints. Either of the other two edges of the frame, at right angles to the film edge, can be the second reference mark. Reference marks must remain in the same position from frame to frame in order for them to be useful. The purpose of these reference marks is to make it easy to register the set of prints by simply tapping their edges against a hard surface, forcing them to become flush with each other.