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.
MANAGERS AND PROJECTIONISTS 785
screen illumination produced; also, unless very expertly handled, there is a possible and probable heavy loss of light. On the whole the ordinary arc is highly inefficient. It should be entirely superceded by the other light sources herein described.
The incandescent lamp, provided it be well handled, not only produces excellent results, but also produces them with a high degree of efficiency. The screen illumination, while not what could be termed brilliant, is most soft and pleasing in tone. The lamp radiates comparatively very little heat, hence is comfortable to handle in summer, or in hot climates ; also it neither breaks nor in any way injures the collector lens.
Until recently this light source was hampered by being compelled to work with a condenser not at all suited to its needs. That difficulty has, however, been overcome. Thanks to the Bausch and Lomb Optical Company and its efficient engineers, a condenser suited to the needs of the incandescent is now available. Its advent has enormously increased the efficiency of results, and has largely added to the range of operating conditions the incandescent can cover with satisfaction to all concerned.
The Reflector Type Arc lamp is the newest arrival in the projection light source field. It is not too much to say that the results obtained with it were little less than astounding to old timers in projection when they first were viewed. When the author of this book first witnessed a demonstration in which a twenty ampere reflector type arc fully equalled the best performance of a 75-ampere ordinary arc he could scarcely believe the evidence of his eyes. It was all quite correct, however, and the reflector arc lamp has leaped into favor because of its enormous efficiency in the production of pure white screen illumination, at a minimum expenditure of electric energy, carbon and replacements.
Today some of our best Broadway theatres — high-priced houses — are getting highly satisfactory results with reflector type lamps using twenty to twenty-five amperes. These thea