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This topic comprises 2 pages: 1 2
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Author
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Topic: DW Griffith Biograph DVDs
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Warren Smyth
Expert Film Handler
Posts: 158
From: Auckland ,New Zealand
Registered: Aug 2003
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posted 04-30-2006 09:39 AM
Leo wrote quote: Leo Enticknap I think that release print elements had four perfs per frame along both edges
Actually Leo, the Pathe and Pathescope release prints had three perforations per frame along one side and just one on the other - opposite the frame line.
Just to complicate things a little, I believe the films made for the Victor projectors had three perforations down BOTH sides and naturally, the Victor projectors' sprockets had three teeth on both sides as well. This meant that Pathe and Pathescope films could not play on the Victor projectors as two teeth for each frame on one side of the sprockets, would not have any perforations to engage. Victor's films however could be played on Pathe or Pathescope projectors and so, as I stated earlier, there was a degree of incompatibility.
It is believed that Pathe didn't want their films shown on projectors of another manufacture, not unlike the restrictive practice that Edison tried to enforce by registering copy protection over the perforations on 35mm film. The two sets of three perforations on Victor products therefore provided a one way incompatibility.
Incidentally, most Pathescope 28mm projectors had the single tooth per frame on one side of all sprockets. On mine, this applies only to the intermittent sprocket with the upper and lower sprockets having no teeth at all on one side, (that side which would normally has a single tooth per frame). I can only assume that this was an improvement to make the projector easier to thread. The film seems to drive through the projector quite well using one set of perforations only.
One perforation per frame engaging on matching teeth on the intermittent sprocket however, means that the film cannot be threaded out of frame. This makes threading through the gate a little easier.
Safety was an issue and non flamable "lavender" prints were used. The projectors had an underwriters approval sticker on the front stating "for use with slow burning film and an enclosing booth not required". [ 04-30-2006, 06:00 PM: Message edited by: Warren Smyth ]
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