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918 HANDBOOK OF PROJECTION FOR
231 — How may clock be made plainly visible without being a
glare spot? 238-239
232 — How may exit signs be made conspicuous without being
glare spots ? 239
233 — Is fact that no one complains of glare spots proof that
they are doing no damage ? 239
Flicker
233a-To what is flicker due ? 613
234 — Is there any excuse for flicker due to opening and closing of projection lens by revolving shutter? 235
235 — Explain action of flicker upon the eye 235-236
236 — Is flicker due to wrong procedure in projection? 235
237 — Does brilliancy of screen surface effect flicker? 235
The Film
238 — Exactly of what does a film consist ? 268
239 — Describe the process of its manufacture 268
240— What is standard thickness of film ? 269
241 — What are standard perforation and film dimensions? 269
242 — Name a few of the more prolific causes of damage to
film 270
243— What is "rain"? 271
244 — Name one chief cause of "rain" 271
245 — Name chief causes of damage to sprocket holes 271-272
246 — Should film repairing be done by anyone other than a
thoroughly competent person ? 272
247 — To what is damage to film in passing through projector
mostly due ? 272
248 — What troubles may badly matched sprocket holes cause?
273-275 249 — In what way may projectionist increase the tendency
of emulsion to deposit on tension shoes? 273
250 — Do poorly made splices do harm ? 275
251 — Should splices be made with the unaided fingers? 277
252— What is correct width of film splice? 277
253 — What is of immense importance in the making of a splice? 278 254 — What is the greatest fault found in film splicing?.... 279 255 — How may film be measured as to its length ? 292
Film Inspection and Repair
256 — What repairs should projectionist make on film? 286
257 — Does price exhibitor pays for film service include inspection and thorough repair of film ? 286 287
258 — Should projectionist be paid extra for time employed in inspecting and repairing films received from exchange in bad condition? 287-288
259 — Describe the usual exchange "inspection" 288