Nation projector carbons (1935)

Page scan 00091 from Nation projector carbons

Record Details:

Title:
Nation projector carbons
Date:
1935
Publisher:
Toronto : Canadian National Carbon Company Ltd.
Volume:
Nation projector carbons
Leaf #:
00091
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Date Added:
May 15, 2025
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"Suprex" Type High Intensity Arc The carbons in the Suprex type lamps are both held in a horizontal position, and the magnetic field, resulting from the current through the carbons, is of equal strength on all sides. The tail flame of the arc therefore surrounds the positive crater in an almost uniform layer, as shown in Figure 68. This condition lacks stability and slight disturbances may cause the crater to burn off on one side and produce a noticeable change in the light on the screen. In some of these lamps an auxiliary magnetic field has been introduced which augments the magnetic flux below the arc and opposes that above it. This gives the tail flame a definite upward trend, as shown in Figure 69, and assures greater stability to the position of the arc stream and the form of the crater. The axis of the negative carbon is placed slightly below that of the positive to compensate for the angular direction of the arc stream. The improvement in the steadiness of screen illumination resulting from the use of this auxiliary magnetic flux is very noticeable, especially when the lamp is operated from a 11 5volt line through a large ballast resistance. It is, of course, essential that this field be of the right direction, and care must be taken, Figure 68 Suprex Arc Without Supplementary Magnetic Field 87