Abstract: The stereoscopic film cartridge is for a stereoscopic viewer having binocular eyepieces and a film driving device. It comprises a thermally formed elongated film tending to roll around itself; and a housing for housing the film, the housing being provided with a first opening arranged to permit engagement of the film driving device with the film when the cartridge is mounted onto the stereoscopic viewer. The housing includes two opposite compartments and a guiding channel extending between the inlets of the compartments, for guiding the film between the inlets. The channel has a front panel provided with right and left adjacent viewing windows, the front panel having an inner surface provided with a first pair of upper and lower parallel projecting bands; and a rear panel comprising translucent means, the rear panel having an inner surface provided with a second pair of upper and lower parallel projecting bands facing respectively the first pair of bands.

Abstract: An aqueous solution of acrylamide is mixed with an aqueous solution containing a polymerization trigger. Firstly at least one of the solutions contains a color indicator having a given color in the solution based on acrylamide and a different color in the solution contained in the trigger, and whose color changeover zone corresponds to the optimum proportions of the reagents in solution. Secondly, during mixing, the respective quantities of the two solutions are adjusted to occupy the changeover zone of the color indicator such that the mixture takes up the color corresponding to the color of the indicator in the solution based on acrylamide. The mixture preferably contains acrylamide, methylenebisacrylamide, and triethanolamide glycol, using ammonium persulfate as the trigger and using bromophenol blue as the color indicator, with the color thereof disappearing after polymerization.

Abstract: A protective composition which comprises at least one aliphatic polyisocyanate, at least one aromatic polyisocyanate and a solvent.