B roll is the secondary or "safety" footage for a film. In order to string together two interview clips that were not shot consecutively, an editor will cut away from A Roll to B Roll, while the audio from the A Roll shot plays under. Then when the editor cuts back to the second A Roll shot, it appears as if the concepts were always married together.
This technique of using the cutaway is common to hide zooms in documentary films: the visuals may cut away to B roll footage of what the person is talking about while the A camera zooms in, then cut back after the zoom is complete. The cutaway to B roll footage can also be used to hide verbal or physical tics that the editor and/or director finds distracting: with the audio separate from the video, the filmmakers are freer to excise "uh"s, sniffs, coughs, and so forth. In fiction film, the technique can be used to indicate simultaneous action or flashbacks, usually increasing tension or revealing information.
"B roll" also refers to footage provided free of charge to broadcast news organizations as a means of gaining free publicity. For example, an auto maker might shoot a video of its assembly line, hoping that segments will be used in stories about the new model year.
The B-K roll bar extension kit consists of the wide u-shaped bar, two connecting bracket plates for the sides (each attached with two small hex bolts and lock nuts), and two brackets for the tops of the roll bar hoops (each attached with two large hex bolts).
Just remove the roll hoop trim, stick the protector tape on, install the side attachment brackets onto the shoulder belt mounts, put the extension in place, and finally attach the 8 bolts that connect the extension to the side attachment brackes and the roll bar hoops.
It's worth noting that the Boxster's factory roll bar is a four-point roll bar—although it's not obvious from outside the car, the roll bar actually consists of two full-width welded pieces which spread the load onto four separate footings on the frame.
It was initially presumed that style 165 rolls were released when the tunes on the rolls were at the height of their popularity, and that the date the tunes were first published would be a good indication of that peak.
Rolls numbered from 6538 upwards to the end of roll production (6724), covering the period 1918 to 1967, prove to have been issued in chronological sequence at regular intervals (TRT rolls 6668 to 6676 must be excluded from the picture; they are mere duplicates, both in numbering and in contents, of earlier Wurlitzer rolls).
For some rolls to which an exact date of issue still cannot be assigned, an estimated issue date is shown, derived from the dates of the tunes on the roll and from the issue dates of the rolls before and after it.
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