Glenn
oes your theater use the xenon bulbs that are designed so they don't emit UV radiation?the lamphouse venting also vented away the ozone generated from the xenon bulbs that weren't treated to prevent UV-a powerful UV source such as a projection lamp can produce ozone-much like those "ozone" bulbs used in old dryers-the ozone was produced from reaction of the shortwave UV radation with the oxygen in the air.The non UV bulbs have a quartz envelope that has an additve in it to reduce the UV radiation.
I can also remember "ad reels" for TV stations-in earlier times the TV station got commercials recorded on 16MM film-these would be spliced back to back onto a large reel and threaded onto the stations 16MM film island projector."Stop foils" would be placed in the film pack where it was to stop.The projector could be started or stopped remotely-usually from the switcher location.
Yes--I have watched for the "Q" marks on films when watching at a theater.And that could be used as a means of "timing" how long you have been watching and how long the movie lasts.And I have seen these on some DVDs.
On the platter that runs without rethreading-do you have to lubricate the film in some manner so the layers in the film pack will "slide" over each other?In my earlier radio days used to rebuild and rewind tape cartridges for radio station in the chain I worked for.Cart tape was specially lubricated so the tape layers could slide over each other-esp in the center of the pack where the tape was drawn off by the capstan so it could go over the machines heads.When the lubricant slowly wears off from playing-(in the top 40 station-songs were recorded on the carts-they got more than hourly airplay)the tape starts to stetch-and then binds up-you can sometimes hear the carts fail on air.and the tape breaks and winds around the machines capstan.I have heard of endless loop systems used for 8 and 16mm film for museum playback systems.Tape cartridges have been used for this too."Marathon" products in Boyolston, Mass made carts for this purpose-they were very reliable.Used them in radio stations.They also held their "phase" for stereo applications."Q" tones on the cart could even be used to activate functions in the museum display as the cart plays.
oes your theater use the xenon bulbs that are designed so they don't emit UV radiation?the lamphouse venting also vented away the ozone generated from the xenon bulbs that weren't treated to prevent UV-a powerful UV source such as a projection lamp can produce ozone-much like those "ozone" bulbs used in old dryers-the ozone was produced from reaction of the shortwave UV radation with the oxygen in the air.The non UV bulbs have a quartz envelope that has an additve in it to reduce the UV radiation.I can also remember "ad reels" for TV stations-in earlier times the TV station got commercials recorded on 16MM film-these would be spliced back to back onto a large reel and threaded onto the stations 16MM film island projector."Stop foils" would be placed in the film pack where it was to stop.The projector could be started or stopped remotely-usually from the switcher location.
Yes--I have watched for the "Q" marks on films when watching at a theater.And that could be used as a means of "timing" how long you have been watching and how long the movie lasts.And I have seen these on some DVDs.
On the platter that runs without rethreading-do you have to lubricate the film in some manner so the layers in the film pack will "slide" over each other?In my earlier radio days used to rebuild and rewind tape cartridges for radio station in the chain I worked for.Cart tape was specially lubricated so the tape layers could slide over each other-esp in the center of the pack where the tape was drawn off by the capstan so it could go over the machines heads.When the lubricant slowly wears off from playing-(in the top 40 station-songs were recorded on the carts-they got more than hourly airplay)the tape starts to stetch-and then binds up-you can sometimes hear the carts fail on air.and the tape breaks and winds around the machines capstan.I have heard of endless loop systems used for 8 and 16mm film for museum playback systems.Tape cartridges have been used for this too."Marathon" products in Boyolston, Mass made carts for this purpose-they were very reliable.Used them in radio stations.They also held their "phase" for stereo applications."Q" tones on the cart could even be used to activate functions in the museum display as the cart plays.
