Handbook of projection for theatre managers and motion picture projectionists ([1922])

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912 HANDBOOK OF PROJECTION FOR 46 — What limits the maximum diameter of a projection lens of given E. F.? 139 47 — What data is it necessary to send when ordering a new proj ection lens ? 139 48 — What range of focal lengths of projection lenses are carried in stock ? 140 49 — What is it necessary to do when you wish to order a projection lens to match one you already have? 140 50 — Can markings of projection lenses be depended upon for accuracy ? 140 51 — What effect, other than light loss, has an accumulation of dirt on surface of lenses ? 146 52 — Name two faults for which projection lenses must be corrected ? How is it done ? 132 53 — How is lens diameter affected by revolving shutter ? . . . . 208 54 — Do you thoroughly understand the lenses you are using? Practical Projection Optics Under this heading will be found many things duplicated in other sections. This is necessary, because, as a matter of fact, practical projection optics really includes about everything. 55 — What is brilliancy of arc crater per unit area? 392 56 — Upon what does total light giving power of crater depend? 392 57 — What effect has distance of light source from collector lens on light delivered to the spot ? 162 58 — What is "working distance" of projection lens? 152 59 — What is "Equivalent Focus" ? 152 60 — Describe universal system of lens measurement 153 61 — Why should lenses be kept perfectly clean? 137-141 62 — Name some satisfactory solution for cleaning lens 137 63 — Name cheap liquid which will remove oil from lenses and clean them very well 139 64 — What kind of cloth or skin should be used to polish lenses ? 137 65 — How often should interior surfaces of projection lenses be cleaned ? 138 66 — How often should you examine and clean exterior surfaces of projection lenses ? 137 67 — What will be the result of wrongly re-assembling elements of projector lens ? 138 68 — What is guiding rule for re-assembling ? 138 69 — What happens if interior of projection lens barrel is not kept black? 138 70 — Why is diameter of projection lens of great importance? 147-148 and 186 to 190 71 — Is it desirable to have projection lens diameter greater than is necessary to receive the entire beam? 148