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BIPACK MAGAZINE
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Since the demand was not great, the bipack magazine evolved with a minimum of modification and design expense, resulting in the overand-under type of magazine, which has persisted to the present time.
In effect, the over-and-under-type bipack magazine is a unit made up of two conventional magazines, one mounted on top of the other. Such a magazine is shown in Fig. 1. The upper section contains the panchromatic film; the front spool is the supply spool, and the rear spool the take-up spool. The lower section contains the orthochromatic film, and, as in the case of the "pan" section, the front spool is the supply spool and the rear spool the take-up spool.
PAN SUPPLY
PAN TAKEUP
ORTHO
TAKE UP
Fig. 1
As is well known to users of bipack film, a bipack is composed of two separate strips of film. One, the orthochromatic, records the blue and part of the green components of the scene to be photographed; the other, the panchromatic, records the red and the remaining green components. In bipack photography, the exposure is made with the two films in emulsion-to-emulsion superimposed relationship, with the orthochromatic emulsion nearest the lens. Thus the exposure is made through the base of the orthochromatic film. When using the over-and-under type magazine, the panchromatic film travels from the forward, or supply spool of the upper section, down into the lower section. The panchromatic film is wound "emulsion in" on the supply spool and travels down into the lower section with the emulsion side facing the lens. Here it is joined by the orthochromatic film, which is wound "emulsion out" on the supply spool.