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  2. Ceiling projector - Wikipedia

    en.wikipedia.org/wiki/Ceiling_projector

    The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (300 m) away and wherever possible set at the same level. The projector is normally set at 90°, although 71° 31' may be used, in relation to ...

  3. Projection screen - Wikipedia

    en.wikipedia.org/wiki/Projection_screen

    Projection screen in a movie theater Home theater projection screen displaying a high-definition television image. A projection screen is an installation consisting of a surface and a support structure used for displaying a projected image for the view of an audience.

  4. Reflector sight - Wikipedia

    en.wikipedia.org/wiki/Reflector_sight

    Diagram of three types of reflector sights. The top uses a collimating lens (CL) and a beam splitter (B) to create a virtual image at infinity (V) of a reticle (R). The bottom two use half silvered curved mirrors (CM) as the collimating optics

  5. Unrotated Projectile - Wikipedia

    en.wikipedia.org/wiki/Unrotated_Projectile

    The No.2 Mk 1 was the first projector to be mass-produced and could launch two rockets, both from two rails. A hand wheel elevated the projector, traverse was by hand-crank and the rocket motors were launched by electrical ignition from a battery. The base of the launcher was embedded in concrete or mounted on a No. 2 firing platform.

  6. Glossary of nautical terms (M–Z) - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_nautical_terms...

    Also ship's magazine. The ammunition storage area aboard a warship. magnetic bearing An absolute bearing using magnetic north. magnetic north The direction towards the North Magnetic Pole. Varies slowly over time. maiden voyage The first voyage of a ship in its intended role, i.e. excluding trial trips. Maierform bow A V-shaped bow introduced in the late 1920s which allowed a ship to maintain ...

  7. Saab 18 - Wikipedia

    en.wikipedia.org/wiki/Saab_18

    The Saab 18 was a twin-engine bomber and reconnaissance aircraft, designed and built by Svenska Aeroplan AB (SAAB) for use by the Swedish Air Force in response to a 1938 design competition.

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