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A firestop or fire-stopping is a form of passive fire protection that is used to seal around openings and between joints in a fire-resistance-rated wall or floor assembly. Firestops are designed to maintain the fire-resistance rating of a wall or floor assembly intended to impede the spread of fire and smoke. [1]
Video head write speed: 525 line 1508 ips (38.3 m/s), 625 39.9 m/sec (1570.8 ips) Video track width 10 mils – .25 mm; Video track pitch 15.6 mils – .40 mm; 16.4 horizontal lines per head in 525. (64 lines recorded per rotation of the head drum assembly) Video track per second 960. Studio reel ~60 minutes, 4,800 feet.
In revision 1.2, released in 2013, a new "Reduced Blanking Timing Version 2" mode was added which further reduces the horizontal blanking interval from 160 to 80 pixels, increases pixel clock precision from ±0.25 MHz to ±0.001 MHz, and adds the option for a 1000/1001 modifier for ATSC/NTSC video-optimized timing modes (e.g. 59.94 Hz instead ...
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The feature served as a replacement for the previous five-star rating system, [3] which was found to be ineffective because of the rare selection of ratings from two to four stars. [4] Of the 42 videos in this list, 6 also appear in the list of most-viewed YouTube videos and 4 appear in the list of most-liked YouTube videos. Note that the ...
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This is the rating required to protect microfilm, microfiche, and other film-based information storage media. Above 150 °F (65.5 °C) film is distorted by the heat and information is lost. A Class 150-2 Hour vault must keep the temperature below 150 °F. for at least two hours, with temperatures up to 2,000 °F. (1,093.3 °C) outside the vault.