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.
Operating Precautions
operation. In some types of lamps, having automatic feed, operation with too short an arc prevents adjustment of the feed mechanism to a point which maintains the carbons in proper relative position.
If it is found that a more desirable screen illumination is obtained with the positive crater out of the indicated position, it will usually be found that the condenser or reflector has also been displaced. In such cases, the optical system should be adjusted so that best results are obtained with the positive crater in the position indicated as correct.
The lamp housing and mechanism should be cleaned regularly and thoroughly and all moving elements of the lamp mechanism kept well lubricated with oil or grease of the consistency recommended by the lamp manufacturer. Complaints sometimes arise from hard grease clogging the feeding mechanism and interfering with the feeding of the carbons. Such troubles can be eliminated by cleaning out the hard grease and replacing with a grade of the proper consistency.
Keep condensers and reflectors clean and well polished. When reflecting mirrors begin to showT disintegration of the silver coating or a grayish color, they should be resilvered.
Instructions for adjusting the position of the optical elements of the lamp are provided by the manufacturer. These should be carefully followed when the lamp is installed and the correct position maintained by adjustment whenever necessary.
Alignment of the lamp with the projection head should be checked from time to time and adjusted when found incorrect.
Keep all electrical contacts throughout the lamp circuit clean and firmly tightened so that full area of contact is maintained.
Particular attention to the care of electrical instruments will be well repaid. Ammeters, voltmeters and
93