F. H. Richardson's bluebook of projection (1935)

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182 RICHARDSON'S BLl'EBOOK OF PROJECTION. (35) Join the two ends and apply an even, heavy pressure for at least five or six seconds — while you count six slowly. (36) Lack of sufficient pressure, or pressure unevenly applied, will result in a weak or otherwise imperfect splice. Excessive pressure, no mattei how much, will do no harm. (37) It is impossible to make a really good splice with the unaided hands for the reason that the film, most probably, will not be cut square or have a correct stub Fig. 58. — Samples of inefficient stub-end scraping. They are all parts of film splices made in projection rooms. end length ; also the pressure will certainly not be evenly applied. An efficient mechanical splicer cuts both ends perfectly square and cuts the stub end at precisely the correct length. It applies ample, evenly distributed pressure and automatically matches the sprocket holes perfectly. (38) All forms of dry scraping of stub ends in making a film splice are unreliable, because the emulsion is only approximately 1/1000 of an inch thick, and it is obviously impossible for a projectionist to maintain an