Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

Record Details:

Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

680 MOTION PICTURE HANDBOOK Caution: Remember when handling limelight gases that oxygen and hydrogen form an explosive mixture when combined. Always turn the hydrogen on first and off last. That is to say, when lighting up never turn the oxygen on until the hydrogen has been lighted, and when shuting down always turn off the oxygen first. Failure to pay heed to this may result in damage to the apparatus. Under certain conditions it might even cause a rather serious explosion, though that is extremely unlikely. Distance of Jet from Lime. — The best distance of tip of burner jet from the lime will vary slightly with size of jet and mixture used. Test the matter as follows: After the light has been burning long enough to have its normal illumination, project the clear, white light to the screen, and, first making sure there is no pit in the lime, slowly move the jet ahead and back until the point of maximum illumination is found. If the tip be too close to the lime its point may be melted. The tip must be closer with a soft lime than with a hard one. "Popping" or "Snapping."— Popping or snapping out of the light is one of the most annoying things the limelight operator has to contend with. It is seldom or never dangerous, except to the hose connections. When the light snaps out turn off the hydrogen quickly, else the flame may back up in the tube and melt the rubber, or even the metal connection at the hydrogen tank, the reducing valve or the saturator. This only holds good when using a gas making outfit in which oxygen passes through the saturator. Popping or snapping (interchangeable terms meaning the same thing) is usually due to excess of oxygen gas. Remedy: Reduce the oxygen. It may also sometimes be traced (though seldom) to the tip being too close to the lime. Popping is in reality a miniature explosion, and sometimes splits the rubber tubing used for connections. For this reason It is best to use flexible, metal-covered tubing, which may be had of any department store or dealer in gas fixtures. It costs but a few cents per foot. Paint the one used for oxygen bright red, to prevent errors in making connections. Light Goes Out. — If your light just simply "goes out," without making any noise, it may be due to (a) leaky or "split tube, (b) cracked or broken lime, (c) tube slipped off connection (should be wired on); (d) gas supply exhausted; (e) valve clogged. The remedy for these conditions is in each case obvious. Revolving Lime. — The action of the flame on the lime is