Journal of the Society of Motion Picture Engineers (1930-1949)

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234 J. M. CALHOUN Vol 43, No. 4 given relative humidity is approached from above rather than from below. The Rate of Swell of Film in Water.— When a photographic film is immersed in water, both the base and emulsion absorb moisture 300 280 260 240 220 200 180 160 140 TIME MINUTE FIG. 6. The rate of moisture absorption of Eastman Motion Picture Positive emulsion (1301, Regular; 1302, Fine-Grain emulsion stripped from the base), and film base in water at 70 F, starting from equilibrium at 50 per cent RH for the emulsion and oven-dry for the base. and begin to swell. The base swells in all 3 dimensions, but the emulsion swells principally in a direction at right angles to the plane of the film. This is due to the fact that the emulsion is firmly attached to the base and, therefore, its swelling is largely restricted to the vertical direction. Fig. 6 shows that emulsions not only absorb more moisture than