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THE LIGHT SOURCE 355
74. Describe the best method of cleaning positive contacts.
75. What can be used in place of a bar in the cleaning
76. How can a minor swelling on the face of ti ■ • t be smoothed off?
77. What forms on the face of a high intensity contact and what will happen if it be not cleaned off frequently?
78. How often should high intensity contacts be deal
79. Should spare contacts be carried in stock ?
Positive Carbon Rotation and Fekd Unit, page 381
80. Is the positive carbon rotated and fed forward by the same element ?
81. Must moving high intensity lamp parts be lubricated ? With what?
When Positive Carbon Fails to Feed Forward, page 381
82. When the positive carbon fails to feed forward what is the trouble ?
83. How much tension should the feeding mechanism apply to the carbon ?
<S4. What may result from too much or too little tension?
85. What should be done if the positive carbon ceases to rotate or feed forward?
86. How do you make a quick test for roughness of contact or for excessive contact tension ?
High Intensity Carbon Contact Pressure, page 382
87. What does improper contact pressure cause?
88. Must the contact pressure have careful, constant attention?
89. Should spare feeding mechanism parts always be kept in stock ?
The Flame Shield, page 383
90. What is a flame shield and what is its purpose?
91. What attention does the hole in the flame shield require?
92. What should be done each day before the performance begins?
93. Should a high intensity lamp be operated without a flame shield ?