(of projectors)
51Geneva drive — Animation showing a six position Geneva Drive in operation The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot …
52Lumen (unit) — The lumen (symbol: lm) is the SI unit of luminous flux, a measure of the perceived power of light. Luminous flux differs from radiant flux, the measure of the total power of light emitted, in that luminous flux is adjusted to reflect the varying… …
53Böwe Bell & Howell — is a U.S. based former manufacturer of motion picture machinery.According to its charter, Bell Howell Company was incorporated February 17, 1907. It was duly recorded in the Cook County Record Book eight days later. The first meeting of… …
54Armagh Planetarium — is a planetarium located in Armagh, Northern Ireland close to the city centre and neighbouring Armagh Observatory in approximately fourteen acres of landscaped grounds known as the Armagh Astropark. History Armagh Planetarium was established by… …
55Livens Projector — Infobox Weapon name=Livens Projector caption=British soldiers loading and fitting electrical leads to a battery of Livens projectors origin=flagcountry|United Kingdom type=Mortar is ranged=yes is explosive=yes is artillery=yes is UK=yes… …
56Page orientation — is the way in which a rectangular page is oriented for normal viewing. The two most common types of orientation are portrait and landscape. The specific word definition comes from the fact that a close up portrait of a person s face and upper… …
57Digistar II — is a planetarium projection system by Evans Sutherland Digistar Users Group. It was released in the early 1990s as a descendant to the earlier Digistar, developed in the late 1970s. The system has been replaced by its full dome descendant, the… …
58Document camera — Document cameras, also known as image presenters, visual presenters, digital visualizers, ( visualisers in the United Kingdom) digital overheads, and docucams, are real time image capture devices for displaying an object to a large audience. Like …
59Matthew Lessner — is an independent award winning filmmaker who lives and works between New York City and Los Angeles.[1] Contents 1 Biography 2 Film career 3 Music video …
60Multiview orthographic projection — Part of a series on …
