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Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 0
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 1
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 2
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 3
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 0
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 1
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 2
Modern Pyramids Bulletins (Set of 7) (1941) National Carbon (Union Carbide), US $150 – Picture 3

Modern Pyramids Bulletins (set Of 7) (1941) National Carbon (union Carbide)

US $150

  • Chattanooga, Tennessee, United States
  • Apr 26th
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Presenting seven (7) Modern Pyramids bulletins published in 1941 by National Carbon Company which is/was a unit of Union Carbide. The bulletins range from four to eight pages and features updates on the company's brushes and commutation. No. 1  (June, 1941 reprint from July, 1937)  - Commutation Factor No. 2  (June, 1941 reprint from September, 1937) - Reprint of "The Measurement of the Frictional Characteristics of Brushes" by Dr. S.W. Glass (National Carbon) from the July, 1937 issue of Iron and Steel Engineer No. 4  (March, 1938)  The Theory of Commutation No. 5  (November, 1938)  An Analysis of Brush Operation No. 6  (April, 1939)  Preparation and Care of Commutator Surface No. 9 (March, 1941)  Cleaning Forestall Service Interruptions No. 10 (July, 1941)  "Feather-Edge" or "Side" MICA - A Frequent Source of  Trouble These bulletins were originally owned by an employee of the Tennessee Valley Authority. I am not an expert but if you have any questions please contact me and thanks for looking!  
“The seven bulletins ranging from four to eight pages are in very good condition and the owner's name is on the front page in the upper right hand corner.”
Product Type Bulletin
Brand Union Carbide
Subject Area Electrical Training & Codes
Country/Region of Manufacture United States
Equipment Type Commutator

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