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MANAGERS AND PROJECTIONISTS 915
135 — Who practices over-speeding ? 216
136 — What is the practical effect of over-speeding? 216-217
137 — Does correct projection speed very often vary with individual scenes in a production? 217
138 — What is correct projection speed, and why is it that adjoining scenes often very? 217
139 — What is one of the very highest functions of the projectionist ? 217
140 — Over-speeding projection, and what it really is 218
141 — Rear projection — when is it practicable? 233
142 — Is rear projection with screen at proscenium line and
projector on rear of stage practicable ? 233
143 — Exactly what is meant by "screen brilliancy"? 43
144 — Tell us why a leader and tail-piece should be used 284
145 — Why should tail-piece be opaque ? 285
150 — Should white light ever be allowed to show on screen
at end of reel? 286
151 — Explain relation of revolving shutter to lens diameter.. 208
Distortion of Picture
152 — Explain what effect a side view of the screen has on
apparent shape of objects thereon 252
153 — Draw diagram showing exactly how much any given side
view will reduce width of object viewed 252
154 — Why is it objects on screen look abnormally tall when
viewed from heavy side angle ? 253
155 — What is meant by keystone effect? 253
156 — Explain why bottom of picture is wider than top when
proj ection is downward 253-254
157 — How would you calculate the exact amount of distortion (keystone) any given angle and distance of projection would produce ? 254
158 — Why is projection angle not a safe guide as to amount
of distortion produced? 255
159 — What is best guide in matter of limit of projection
angle? .255-256
160 — What effect has added projection distance on distortion,
lens height above screen center remaining the same?. .. . 256
161 — In what proportion does added angle of projection distort the picture? . . 257
162 — Does making sides of picture perpendicular remove picture distortion ? 257
163 — Wherein lies the evil of picture distortion? 257
164 — Can a picture be projected at an angle without distortion? 254-255-256-257
165 — How can you make sides of the picture parallel when
there is pitch in projection ? 258
166 — Is keystone effect accompanied by out of focus? 258
167 — How may out of focus effect due to pitch in projection
be overcome? . . 258