Nation projector carbons (1935)

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.

CHAPTER II Manufacture of Projector Carbons FROM a thoroughly modern plant, devoted exclusively to the manufacture of carbon products, National Projector Carbons go out to all parts of the world. Accuracy and precision mark every step in production, from raw material to finished product. The raw materials used in the production of projector carbons are the purest commercial forms of carbon, such as lampblack, and the bonding agents, tar and pitch. The tar and pitch are refined and distilled to the required viscosity under conditions which permit very close control. A view of the pitch plant is presented in Figure 1. The lampblack is produced by burning oil or other suitable hydro-carbons Figure 1 General View of Pitch P in a special furnace, Figure 2, under carefully controlled conditions of temperature and restricted draft. Conditions are chosen which leave unconsumed a large part of the carbon in the fuel and this settles out in the form of soot or lampblack in the large settling chambers through which the products of combustion pass. Careful laboratory tests at this, as at every subsequent stage of production, check the purity and essential physical characteristics of the product to make sure that it is held to the required standards. A portion of the laboratory is shown in Figure 3. 11