Figure 4-6. Arc lamp assembly, installed.
4-27. Carbon Electrodes
carbons. The wires to the carbons are covered with an
a. Description. The electrodes used in the arc lamp are.
asbestos wrapping which acts as insulator from the intense
10 mm by 12 inches long, 50-ampere, copper-coated
heat thrown by the arc lamps during operation.
carbons. The upper carbon (5, fig. 47) is rated as high
intensity and the lower carbon (8) as a white flame type;
therefore, care must be taken in replacing the proper
(1) Open the reflector doors (12, fig. 4-7) and
electrode. The carbons are held secure in the arc lamp by
grasp the upper arm, as shown in figure 4-8. Move the upper
vise type insulated carbon holders (and 10) which are
arm up to separate upper and lower carbon ends.
fastened to the arms (4 and 9) by thumbscrews. The upper
and lower arms are adjustable so that they can be moved up
or down to facilitate the removal or replacement of the