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

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MANAGERS AND PROJECTIONISTS 911 17 — For practical purposes what may we assume the amount of refraction rays will receive in passing through a lens will depend ? 129 Lenses 18 — Explain the difference between a piano convex, a meniscus and a bi-cpnvex lens 168-169 19 — What is the principal axis of a lens ? 126 20 — What is meant by working distance ? 129-152 21 — What is meant by conjugate foci ? 126 22 — What do you understand equivalent focus to mean?. .129-152 23 — What is spherical aberration ? 129 24 — What is chromatic aberration ? 130 25 — What does focal length mean as applied to a simple lens? 134 26 — Explain, roughly, the action of light through a lens.... 131 27 — What is meant by correcting a lens? 134 2&' — Explain how an image is formed 133-134 29 — How is curvature of simple lenses determined? 134-135 30 — Is it possible to focus an object having area to a point? 133-135-136 31 — Why is it impossible to focus the condenser beam to a point? .133-135-136 32 — What relation has revolving shutter to lens diameter ? . . 208 Lenses — Projection Lens 33 — What is a projection lens ? 38 34 — What is the function of a projection lens? What does it do? : 126 35 — Of what elements does a projection lens consist? 136 36 — What is meant by the "front factor" and "back factor" of a projection lens ? 136 37 — Which lenses of a projection lenses are cemented together, and with what are they cemented ? 136 38 — What is the optical effect of cementing the lenses of the front factor together ? 144 39 — Are the lenses of the back factor always separated by snacing rings ? 136 40 — What occasionally happens, or what may happen to the cement (balsam) between the front factor lenses? 137 41 — Should or should not the lenses of projection lens be clamped tightly in their individual mounts? 138 42 — How should Gundl^rh-Manhattan lenses be re-assembled ? 139 43 — Is it possible to repair a projection lens if one of its lenses be broken ? 139 44— Should broken lens referred to in question 43 be sent to manufacturer ? 139 45— Have odd lenses, or combinations of lenses, any value?. . 139