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THE LIGHT SOURCE
115. What is the candle power of the low intensity arc per square mm of crater floor area?
116. How much may the amperage vary?
117. What is the average increase in the crater area fol added ampere of current?
118. Is brilliancy of the carbon core uniform?
119. What elements demand constant attention when low intensity, reflector type light sources are employed ?
120. How is the condition of wires inside the lamphouse determined ?
121. What attention does the mirror require?
122. How are mirrors cleaned?
123. Describe how to fix the right distance of the arc from the mirror.
124. What lubricant should be used in the lamp?
\2S. Give a short summary of the necessary operating condi tions for the old style d. c. arc.
Low Amperage Non-rotating H.I. Arcs, page 390
126. What were the two major types of projection arc light sources on which theatres were forced to rely until recently?
127. What is the effect of high and low electrode current density upon light source brilliancy per unit area?
128. How does the non-rotating high intensity carbon differ from other light sources ?
129. What elements in light sources are important in considering screen illumination values?
130. What are the chief characteristics of the high intensity arc?
131. Before the non-rotating carbon what was the smallest carbon diameter available? How many amperes did it require for satisfactory operation?
132. What is the chief similarity between the non-rotating I I.I carbon and the larger diameter high intensity lighl source?
133. What other factors of the non-rotating carbon make it extremely efficient?
134. What is the importance of the gas stream in all high intensity arcs?
135. How does the position of the negative and positive carbons affect the gas stream ?
136. Must the carbons be precisely in line with each other sidewise?